F region
【气象学】F区,F(电离)层(＝F layer)
🧩 词语组成解析
🗣️ 情景例句
He's working with me during the summer months as an intern.
在夏天的这几个月到我这里来当实习生。
About how long does it take?
大约要坐多久？
How many different models of this do you offer?
这个你们有多少种不同的型式。