Seim
abbr. simple effective index method 简单有效折射率法
🗣️ 情景例句
to be with people--people his own age.
和别人交往像他那般年纪的人。
An idle youth,a needy age.
少壮不努力，老大徒伤悲。
Quite by accident. I moved a few peas and there it was.
很偶然。我挪了几颗青豆就发现了。