正常人都有两只眼睛，当 eyes 用来描述一个人时，它的数量最多就两个，那么 all eyes 就显得没有必要了。如果我们要表达某人的一双眼睛，通常用 sb's eyes，而不是 all sb's eyes，由此可见 be all eyes 另有它意。
在聊“be all eyes”的含义之前跟大家来聊一聊“be all ears”的用法。Be all ears 表示全神贯注或聚精会神地听。
举个例子：
She had expected him to be all ears when she told him about her wedding plans.
当她告诉他她的婚礼计划时，她原以为他会全神贯注。
同样地，be all eyes表示全神贯注地看或目不转睛等，相当于 pay close attention to sth。
举个例子：
The children were all eyes when the magician started performing.
当魔术师开始表演时，孩子们目不转睛。
We were all eyes as the celebrity guests emerged from the car.
当名人来宾从车里出来时，我们都盯着看。
