Without enough iron, kids might get tired more easily.
没有足够的铁，孩子会更容易疲倦。
Lifestyle can really throw a monkey-wrench in the process, no matter how dedicated the sleeper wants to be: no amount of iron will can compensate for a hectic work-schedule, or kids, etc.
生活方式总是会让这个过程进行得不那么顺利，不管实践者怎样努力，再多铁一般的意志也弥补不了一个繁忙的工作日程或者照顾孩子等等。
Girls who have gotten their periods lose some iron every month through their menstrual flow and active kids lose iron through their sweat - weird!
女孩会在每月时期经期失去一些铁而好动的小孩子会通过流汗失去铁——挺奇怪的！
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