Unstable equilibrium
[化] 不稳定平衡
🧩 词语组成解析
🗣️ 情景例句
Just make the few changes I suggested and your letter will be perfect!
只要改动我提到的个别地方，你的信就会很完美了。
Sightseeing
观光
It must have been about two in the morning when I returned home.
我回到家时，肯定已是凌晨两点左右了。