Underreamer
扩孔器
🗣️ 情景例句
He turned over his company to his son last year.
去年他把公司交给儿子管理。
My schedule is very flexible, and I am given a lot of freedom.
我的工作表很有变通性，使我十分自由。
I have some difficulty in pronouncing some of the words in English.
我有些英语单词发音不好。