kids' stuff
noun [ U ] UK disapproving uk/ˈkɪdz stʌf/ us/ˈkɪdz stʌf/ (US kid stuff)
极简单的活动（或事情）；小儿科
an activity or piece of work that is very easy
A five-mile bike ride? That's kids' stuff. 骑5英里自行车？那太简单了。
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