Pentaether
五醚, 四甘醇二丁醚
🗣️ 情景例句
Sorry to keep after you, but could you tell me...
对不起，又打扰你了，你能告诉我…
Many good cows have evil calves.
很多好母牛，会生坏小犊。
That is John Smith,isn't it?
你是约翰。史密斯，对吗？