Dolostone
白云岩
🗣️ 情景例句
Are you all right?
你怎么了？
The chance to enter the college came and he took it.
有一个上大学的机会，他抓住了这个机会。
when H.M.S. Porcupine was put at the disposal of the Royal Society for several cruises,
皇家学会用英国"豪猪号舰艇进行了几次巡航后，