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汉语拼音：huó sāi

汽缸或泵里往复运动的机件，通常圆盘形或圆柱形。在发动机汽缸里，活塞的作用是把蒸汽或燃料爆发的压力变为机械能，推动机器运转。旧称鞲鞴（gōubèi）。

1. 气缸里或唧筒里往复运动的机件，一般是圆饼形或圆柱形。在发动机气缸里，活塞的作用是把蒸气或燃料爆发的压力变成机械能。在唧筒里，活塞的运动能改变压力，把流体抽出或压入。亦比喻事物的枢纽。

   《解放日报》1945.1.14：“当地金融市场发生着黑市。虽然掌握市场活塞的人用尽了智慧。”

• The pistons are graphite-coated to reduce friction.

  活塞上涂了一层石墨以减小摩擦力。

• Let's get the lathe to turn the new piston.

  咱们用车床车[加工]新的活塞吧.

• They use a piston engine instead.

  他们改用活塞发动机.

• Tell the foundry to cast another piston.

  告诉铸铁间再铸一只活塞.

• The piston moves by steam pressure.

  活塞在蒸汽压力下运动.

• The piston froze in the cylinder.

  活塞冻牢在汽缸里.

• A piston links to a drive shaft by means of a connecting rod.

  活塞通过连杆与驱动轴相连.

• Heat is thereby converted into mechanical energy of the piston.

  热由此转换成活塞的机械能.

• Steam in a cylinder expands to push a piston outward.

  气缸中的蒸汽膨胀并推动活塞向外运动.

• In the roundpiston VV carburetor, the piston is moved by intake - manifold vacuum.

  在圆形活塞的VV化油器中, 活塞是由进气歧管真空移动的.

• All but plug and backmix require rather sophisticated mathematical analysis.

  除了活塞流与逆混流之外,其它都需要比较深的数学分析.

• The catalyst is subjected to a uniform ram pressure.

  催化剂承受均匀活塞压力.

• A molecule striking an advancing piston recoils with increased speed.

  撞在前进中的活塞上的分子,会加速反跳.

• The connecting rod is attached to the piston by the piston pin.

  连杆与活塞的连接是采用活塞销.

• A shaft on the piston forms the armature of a coil.

  活塞轴作线圈的衔铁.