因而Bailey又提出“平均有效时间”(mean effect time)，用以说明药物浓度与药物效应的相关概率，对预测麻醉后的恢复时间又提供了一个有用的指标。
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mean effect time
平均生效时间
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In addition, the act of breastfeeding has a contraceptive effect which would mean that in the past a teenager would be unable to become pregnant for a second time while feeding her first child for several years.
BBC: Second-time teen mothers at risk
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