Pentaether
五醚, 四甘醇二丁醚
🗣️ 情景例句
Well, I'd describe it as a book which is a ...
嗯， 我会把这本书形容一幅……
He gave a straightforward answer.
他给予了坦率的回答。
OK. But I'm afraid I may be a little late.
好。不过我恐怕会稍晚一点到。