The small piston inner top comprises a center cover or a connected center cover.

小塞内顶由中盖或连筋中盖组成。

youdao

The piston compressor, the oldest in places such as the cold storage, many central air conditioning unit, and small piston compressor in the fridge and air conditioning.

活塞式压缩机资格最老，用的地方很多如冷库、中央空调机组、还有小型活塞式压缩机用在冰箱和空调中。

youdao

Dual piston gear, output torque, small size.

齿轮式双活塞，输出力矩大，体积小。

youdao

The Mustang feels like a small business jet, whereas the Eclipse felt like a small twin piston airplane.

FORBES: Cessna's Mustang Refutes The Decline Of Capitalism

Two are small businesses replacing their aging turboprops or twin-engine piston planes.

FORBES: Cessna's Mustang Refutes The Decline Of Capitalism

Makers of fixed-wing aircraft are also looking at diesel engines, in small planes at least, where they show promise as a serious alternative to standard piston engines, which run on a high-octane form of petrol.

ECONOMIST: Monitor