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an electronic device that uses a small electrical current to control a larger current, acting like an automatic switch
继电器（电子设备）
a type of rolling-element bearing that uses balls to maintain the separation between the bearing races, reducing friction and enabling smooth rotation
滚珠轴承
a mechanical transmission system using a flexible belt to transfer power between rotating shafts
皮带（机械）
a type of nuclear reactor that generates more fissile material than it often consumes
增殖反应堆
an environment that can be used to verify the correctness of a model or design
用于评估某事物的环境
a wheel with a set of square or triangular teeth sticking out around the edge that fits into the edge of a similar wheel, causing both wheels to turn
雉堞
a device that allows movement between mechanical parts of a machine or converts backward and forward motion into circular movement
曲柄
a mechanical component that transmits rotational power from the engine to the wheels or other driven components of a vehicle or machine
传动轴
gears, toothed wheels, or mechanical components designed to transmit and control power between rotating shafts in a machine, vehicle, or system
传动装置
a thorough inspection and repair of a machine or system to improve its performance or extend its lifespan
维修工程
a toothed wheel with projections that mesh with a chain, track, or other perforated or indented material, typically used to transmit motion or power in machinery, vehicles, or bicycles
链
a machine tool that rotates a workpiece so you can shape it by cutting, sanding, or drilling
车床
a professional who uses specialized software to create detailed drawings and plans for buildings, machines, or products
借助计算机进行设计的人
a permanent fastener with a head on one end and a deformable shaft that forms a second head when joining materials together
铆钉
a method used to extract natural gas or oil from deep underground by injecting high-pressure fluid to fracture rock formations
水力压裂
an electric device that is used to increase or decrease the voltage of an alternating current
变压器（电力设备）
a facility that transforms voltage levels and regulates electrical currents, typically situated in an electrical power distribution system
变电站
a chemical reaction between a fuel and an oxidizing agent, typically producing heat and light
燃烧
a pipe, tube, or channel that is used to protect, enclose, or route electrical wires, cables, or other utilities for the purpose of safe and organized transmission
电气导管
an electric current that reverses direction periodically, typically used in power distribution systems due to its efficiency in long-distance transmission
交流电
a gas, especially methane, that is produced as a result of the decomposition of animal or plant remains, which is used as fuel
沼气
a type of fuel made from living matter, such as plants or waste, that can be used as a renewable energy source
生物燃料
