Difluoroethylene
二氟乙烯
🗣️ 情景例句
are important for the sales of your book.
对于你这本书的销售很重要。
Knowledge is a treasure, but practice is the key to it.
知识是一座宝库，实践是打开宝库的钥匙。
He spent a miserable day in bed thinking of all the fun he was missing.
他在床上郁郁不乐地躺了一天，想着他错过的种种欢乐。