英文知識王名詞CEFR B2
pistons
A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)、A valve device in some brass instruments for changing the pitch
各國口音發音
一句話記住 pistons
pistons 的核心意思是「A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)」，是一個名詞。
