在适当的年龄教给孩子相应礼节，并在童年时期一以贯之地巩固，这是教会孩子懂礼貌的最有效的一个方法。
Teaching them manners at the right age and reinforcing them through their childhood is one of the most effective ways to teach your child to be polite.
中古时期至20世纪中期，在科学家们找到更有效的方法之前，砷一直是杀死臭虫的王牌。
Arsenic remained king of bug killers from medieval times up to the mid-1900s, when science found something more effective.
但omega - 3只是益脑食物的冰山一角；已经证实许多营养物质有促进认知的功效，不仅是在儿童时期吃这类营养品有效，而是终身可食用受益。
But omega-3 is just the tip of the nutritional iceberg; many nutrients have proven cognitive effects, and do so throughout a person's life, not merely when he is a child.
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