名词
中文翻译：月经初潮
同义词：
['onset of menstruation', "menstrual period例句：1. Menarche is the first day of a girl's menstrual cycle.（月经初潮是女孩月经周期的第一天。）2. The onset of menarche can be difficult for some girls.（月经初潮对一些女孩来说可能很难。）"]
例句：
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1. Menarche is the first day of a girl's menstrual cycle.
月经初潮是女孩月经周期的第一天。
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2. The onset of menarche can be difficult for some girls.
月经初潮对一些女孩来说可能很难。
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3.She has been experiencing her first menstrual cycle since she turned 12.
她从12岁开始第一次经历月经周期。