... selection cycle 释义：选择周期 pregnancy cycle 释义：妊娠周期 catalytic cycle 释义：催化性循环 ...
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激素周期变化。经前综合症的体征和症状随着激素的变化而发生变化，而在妊娠期和更年期的时候会消失。
Cyclic changes in hormones. Signs and symptoms of premenstrual syndrome change with hormonal fluctuations and disappear with pregnancy and menopause.
如果漏服了一个周期内的一片或者数片药物，那么该周期内非意愿性妊娠的风险将增加。
If, however, you've missed a dose - or several doses - during a cycle, you might be at higher risk of unintended pregnancy during that cycle.
用尿促性素的妊娠率是每周期25%。
The pregnancy rate with gonadotropin therapy is 25% per cycle.
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