撞肘是一种非正式的问候方式，两个人通过肘部轻触或者撞击来问候对方。
The elbow bump is an informal greeting where two people touch, or tap, elbows.
空2到4行打上你的问候语，同样要使用正式的名字，以冒号结束，例如：“Dear Mr.Jones
Skip two to four lines and follow with your greeting, again using the formal name and closing with a colon "Dear Mr. Jones:" for example.
在英语中有很多问候的方式可以用在正式和非正式的场合里。
There are lots of ways of greeting in English which can be used in both formal and informal situations, eg: How are you doing?
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