A roller bearing
滚柱轴承
🧩 词语组成解析
🗣️ 情景例句
Americans consider it extremely bad manners to be late.
美国人认为迟到是一种极不礼貌的做法。
Hotels in America don't usually serve dinner in the rooms.
在美国的旅店里，正餐通常是不送到房间里。
John works very hard. He goes to work early.
约翰工作很努力。他早早上班。