When something funny happens and people or a person in a group laughs, they will look at the person they like or care about in the group the most to see if they're laughing too. When you notice this it's quite easy to tell who likes who.
当有趣的事情发生，或者一伙人里有人笑时，他们会观察自己喜欢的人或大部分人是否也笑。知道这一点，你可以很轻松地知道谁喜欢谁。
it's quite easy to do sth：很轻松地做某事。
eg. Actually, it's quite easy to imagine.
It's quite easy to predict when the relatives are missing
tell：辨别，识别
eg. It's impossible to tell who will win.
You can't tell where the mend is.
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