顾老师英语轻松学

Trichloromethane 🔊 was 🔊 once 🔊 widely 🔊 used 🔊 as 🔊 an 🔊 anesthetic 🔊 , but 🔊 its 🔊 use 🔊 has 🔊 been 🔊 largely 🔊 discontinued 🔊 due 🔊 to 🔊 safety 🔊 concerns 🔊 .

三氯甲烷曾经被广泛用作麻醉剂，但由于安全问题，它的使用已经被很大程度上停止了。