这是个行话，但是这个想法是简单而有用的：只要你没有忘记你是在盯着一个人的身体的话，那么注视其他人的身体是可以的(即使是长时间的)。

That's jargon, but the idea is a simple and useful one: it's ok to stare at someone else's body (and even long for it) as long as you don't ever forget that you're looking at a person.

youdao

彼此的注视和盯着看的不同之处就是：当人们允许他人侵犯自己的隐私的时候，他们已经不再感觉受到威胁了。

The difference between mutual gazing and staring is the consent; people are giving each other permission to invade their privacy in way that is normally quite threatening.

youdao

但爱德华·卡伦整个背部都僵住了，他慢慢转过身来，盯着我——他的脸英俊得不可思议——用洞悉一切，充满厌恶的眼神，注视着我。

But Edward Cullen's back stiffened, and he turned slowly to glare at me - his face was absurdly handsome -with piercing, hate-filled eyes.

youdao