Piston knock
[机] 活塞敲击
🧩 词语组成解析
piston
['pɪstən]
n. <机>活塞;
knock
[nɑk]
n. 短促的敲打（声）;爆震声;敲击声;敲门（或窗等）声;
vi. 猛烈敲击;与某物相撞;撞到了桌子;
vt. （心）怦怦跳;把…撞击成（某种状态）;批评;
🗣️ 情景例句
That might be sooner than you think.
那也许比你想像的要快。
If you want knowledge,you must toil for it.
若要求知识，须从勤苦得。
Don't crowd round him, said the gate keeper.
“不要围着他，”学校门卫说。