Pentaether
五醚, 四甘醇二丁醚
🗣️ 情景例句
Will you be all right?
你不会有问题吧？
I have confidence in myself.
我对自己颇具信心。
Last week No.14 Middle School held a sports meeting on the playground.
上星期第十四中学在操场举行了一次运动会。