In terms of bearing capacity, the performance of the worm gear type is better than that of the tooth type, and when the enveloping worm drive is used, its bearing capacity, deformation resistance and transmission rigidity are further improved. However, the worm gear slewing drive is inferior to the gear slewing drive in terms of efficiency. According to the openness of the slewing drive transmission mechanism, the slewing drive can be divided into an open housing slewing drive and a closed slewing drive. http://www.ldb-slewdrive.com/open-housing-slewing-drive/

A T shirt, or tee shirt, is a style of fabric shirt named after the T shape of its body and sleeves. Traditionally, it has short sleeves and a round neckline, known as a crew neck, which lacks a collar. T-shirts are generally made of a stretchy, light, and inexpensive fabric and are easy to clean. The T-shirt evolved from undergarments used in the 19th century and, in the mid-20th century, transitioned from undergarment to general-use casual clothing. http://www.ohsuregymwearoem.com/t-shirt/

Designed in 1835, the gas regulator's concept is easy, and its impact has been long-lasting. There are various types of regulators, but their function is the same: to use a valve system to control natural gas or propane pressure or other gas flow. Common appliances that use regulators include gas stoves, propane grills, or oxy-fuel bottles for welding. Each type of regulator's components consists of a set spring attached to a rod that runs down from a set screw through a diaphragm into the valve. http://www.peakgasregulator.com/gas-regulator/

Galvanized steel pipes are divided into cold galvanized steel pipes and hot-dip galvanized steel pipes. Cold galvanized steel pipes have been banned. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and gradually banned galvanized pipes. Four ministries and commissions including the Ministry of Construction of China have also issued a document stating that galvanized pipes are prohibited from being used as water supply pipes since 2000. http://www.ruijiesteelpipe.com/galvanized-steel-pipe/

The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus. The GI tract contains all the major organs of the digestive system, in humans and other animals, including the esophagus, stomach, and intestines. Food taken in through the mouth is digested to extract nutrients and absorb energy, and the waste expelled at the anus as feces. Gastrointestinal is an adjective meaning of or pertaining to the stomach and intestines. http://www.soudonmed.com/gastrointestinal/

The USB cable is used for the connection and communication between the computer and external devices, and can also be used for the charging of the mobile phone and the connection with the outside, that is, for data transmission and charging. USB is the most widely used external bus standard in the PC field. It is used to standardize the connection and communication between the computer and external devices. The USB interface supports the plug-and-play and hot-swap functions of the device. http://www.toplinkall.com/usb-cable/

Honeycomb ceramic is a new type of ceramic product with a honeycomb-like structure. It is widely used in chemical, electric power, metallurgy, petroleum, electronic appliances, machinery and other industries from the earliest use in small automobile exhaust purification, and it is becoming more and more extensive, and its development prospects are considerable. Honeycomb ceramics are composed of numerous and equal pores in various shapes. http://www.xichuangcatalyst.com/honeycomb-ceramic/

In a piston engine, a piston rod joins a piston to the crosshead and thus to the connecting rod that drives the crankshaft or (for steam locomotives) the driving wheels. Internal combustion engines, and in particular all current automobile engines, do not generally have piston rods. Instead they use trunk pistons, where the piston and crosshead are combined and so do not need a rod between them. The term piston rod has been used as a synonym for 'connecting rod' in the context of these engines. http://www.chennamachinery.com/piston-rod/

Sugarcane cutlery includes a lot, such as Biodegradable Soup Spoon, Disposable Knife Fork and Spoon, Non Plastic Disposable Cutlery, Paper Fork and Spoon, etc. Biodegradable spoon refers to spoons that can undergo biochemical reactions under the action of microorganisms (bacteria, molds, algae) and enzymes in the natural environment, causing mildew in appearance to change in internal quality, and finally forms carbon dioxide and water. It uses two kinds of materials http://www.degradabletableware.com/sugarcane-cutlery/

A backpack—also called knapsack, schoolbag, rucksack, rucksac, pack, sackpack, booksack, bookbag or backsack—is, in its simplest frameless form, a fabric sack carried on one's back and secured with two straps that go over the shoulders, but it can have an external frame, internal frame, and there are bodypacks. In the era of more and more individuality, various styles such as simplicity, retro, and cartoon also cater to the needs of fashion people to show their individuality from different aspects. http://www.galaxytrendbags.com/backpack/