Unstable equilibrium
[化] 不稳定平衡
🧩 词语组成解析
🗣️ 情景例句
I didn't have that when Richard and Susan were born.
在Richard和Susan出生时我可没有人帮忙。
He isn't really serious; he's just playing games with her.
他并不是一本正经，只是跟她玩玩游戏而已。
Is it a black cat with one white ear and two white legs?
是那只长着一只白耳朵和两条白腿的黑猫吗？