Commutant
换位子群, 导出群
🗣️ 情景例句
but, unfortunately,
但是， 很不幸，
I want to buy some traveller's checks.
我想买些旅行支票。
The world had to wait almost another 100 years for the Channel Tunnel.
世界不得不再等将近100年才看到海峡隧道竣工。