Knock against
（使）撞击, 击打; 偶然碰到; 磕碰
🧩 词语组成解析
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
Notices are displayed on the bus asking people not to smoke.
公共汽车上张贴着请勿吸烟的公告。
How I wish the vacation would last longer!
如果假期长一点那该多好。
We've got to do something about the neighbor's dog!
我们得对邻居的狗采取点行动了！