- 脚步: footstep; tread; step; pace
- 变换: vary; alternate; commutation ...
- 逆步变换, 反步变换: contragradient transformation
- 异步变换: asynchronous conversion
- 脚步: footstep; tread; step; pace 加快脚步 quicken one's pace; 放轻脚步 walk lightly; 脚步重 tread heavily; 脚步声 footfall; footsteps
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