express [ɪk'spres; ek-] vt. 表达；快递 adj. 明确的；迅速的；专门的 n. 快车，快递；捷运公司

eg: The anxiety of the separation often expresses itself as anger toward the child for getting lost.
对失散的焦虑常常表现成对孩子走失的愤怒。

输出，出口