Precray
前贝壳灰岩的
🗣️ 情景例句
He keeps himself fit by running 5 miles every day.
他每天跑五公里以保持身体健康。
What time is the mail delivered on Saturday?
邮件在星期六什么时间被递送？
Were you in San Francisco at the time of the big earthquake in 1989?
1989年旧金山大地震时，你在那儿吗？