revolutions例句

The shaft and discs rotate at about forty revolutions per second.
竖轴和磁盘每秒钟大约旋转40转.

This machine runs at speed of 500 revolutions per minute.
这台机器每分钟500转.

The drum is rotated at 20 revolutions per minute for 10 minutes.
圆筒以每分钟20转的速度转10分钟.

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