displacer
n. 置换剂;取代剂;平衡浮子;排代剂
例句
The displacer is still in its highest position.
置换器仍处于其最高位。
A Stirling engine has a piston and a displacer.
斯特林发动机具备活塞及置换器。
"Displacer" (e) should be in the middle of it's travel up and down.
“置换剂”(五)应在这中间下来的旅游起来。