He hit back angrily, saying such remarks were childishly simplistic.他愤怒地反驳说, 这样的话真是太简单幼稚了。

He knew that he had behaved childishly.他知道自己的行为很幼稚。

I still get childishly excited by every new menu.每推出一份新的菜单, 我仍然会像孩子般兴奋起来。