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- 秒回零杆锤头second hammer
- 回(a measure word for matters or actions) a time
- 回覆responses
- 回家homeward
- 回应responses
- 空回backlash
- 秒钟second clock
- 每秒per second
- 一回bout
- 回路loop
- 纳秒ns
- 重回return
- 钟摆摆动计秒。A pendulum vibrates seconds.
- 带回lead back
- 每秒钟per sec.
- 回馈repayment
- 飞秒femtosecond
- 回放playback
- 回事matter
- 回调call-back