Reaction propulsion
反作用力推进
🧩 词语组成解析
🗣️ 情景例句
Oh, this is my father. He's a doctor.
噢， 这是我父亲， 他是一名医生。
I've lived here for five years.
我住在这里有5年的时间了。
She finished it at half past nine. She went to bed before a quarter to ten.
30 她完成了作业。她9：45之前上床睡觉。