区别在于中间结果必须使用每秒的毫秒数进行转换。

The difference is that the intermediate result must be converted using milliseconds per second.

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如果测试运行的时间超过指定的毫秒数，则测试失败。

If the test takes longer than the specified number of milliseconds to run, the test fails.

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此外，如果需要精确控制动画时间，那就需要用参数指定毫秒数。

Additionally, if you need to control exactly how long an animation takes, you can also pass in the number of milliseconds as the argument.

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