learning how to smile
学会微笑
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The Smile Bunnies Child's First Brush has been designed as a training brush for the very youngest children who are just learning how to brush.
宝宝第一把训练牙刷，美国的牙科专家为刚刚开始练习刷牙的宝宝而独特设计，让宝宝了解到如何学习刷牙。
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