Impasses
n. 绝境（impasse的复数形式）
🗣️ 情景例句
Hi Leo, do you know Jack Wang?
嗨，利奥，你知道杰克王吗？
Will you please lock the door when you leave?
请您当你离开时，锁门？
below 20 per cent, its bactericidal action is negligible.
浓度低于20％时，杀菌能力基本上就不存在了。