Perfluoroethylene
[机] 四氟乙烯
🗣️ 情景例句
And I'm planning to get a job for the summer.
我想在暑假打工。
There's a cool breeze this evening.
今晚有凉爽的微风。
A young English writer made the pertinent observation a year or two back
一两年前，一位年轻的英国作家发表了中肯的看法。