Bellwethers
系铃的公羊( bellwether的名词复数 )；前导；领导者；群众的首领
🗣️ 情景例句
How much paint, how many hours of work ...
多少油漆， 多少小时的工作量……
I was impressed very much.
我有深刻的印象。
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。