Chemene
季銨化合物
??? 情景例句
Look before you leap.
三思而后行。
He always comes rushing up at the last moment.
他往往到最后的一瞬間才急忙趕來(lái)。
Be that as it may, the nerve poison does its business with man far more quickly than the blood poison.
不過(guò)，神經(jīng)毒辣液比溶血性毒液在人身上起作用快得多。