情感等)不外露的;惯于掩藏自己的;有城府的tending or liking to hide your thoughts, feelings, ideas, etc. from other peopl

中文解释

这一点,加上飞行器仍是人们普遍嘲笑和讥讽的对象,使得兄弟俩只能暗地里行事。

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