The exact length of each period may vary.
每一时期的确切持续时间可能有所不同。
The Tertiary Period was separated into division of time that were equal in length.
第三纪被划分为等长的时间单位。
So, you see that the period is extremely sensitive to the length of the string.
现在，这个周期，对于绳子的长度，十分敏感。
Mothers of twins won again in the length of their reproductive period.
在育龄期的长度而言，双胞胎的母亲们也略胜一筹。
Furthermore, the length of the adolescent period may change in a given society.
除此之外，青春期的长度会在特定的社会发生改变。
The length of the exercise period should also be reduced if there is discomfort.
只要感到不自在，就该缩短练习的时间。
The length of the exercise period should also be reduced if there is discomfort.
只要感到不自在，就该缩短练习的时间。
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