Heptachlor
[化] 七氯\\n[医] 七氯, 七氯四氢甲е(一种杀虫剂)
🗣️ 情景例句
It's a deal.
一言为定。
It's earier to run down the hill than go up.
下山容易上山难。
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。