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1·That day, accidentally, I saw a net friend's poster about seeing someone off at the airport, very touching.

这天，不经意的看到一个网友写了一篇关于机场送别的帖子，情深感人。

2·That day, accidentally, I saw a net friend's poster about seeing someone off at the airport, touching indeed.

这天，不经意的看到一个网友写了一篇关于机场送别的帖子，情深感人。

3·Seeing someone off with an osier is a Chinese tradition. And popularly it was considered to have some relation with a homonymic phenomenon between the Liu(osier) and Liu(stay).

中国有悠久的折柳送别传统，对于这一民俗形成缘由解释较为纷繁，一般认为以“柳”谐“留”，是谐音现象。

4·She scanned the crowd on the off chance of seeing someone she knew.

她扫视着人群，抱着一线希望看是否有熟人。《牛津词典》

5·Definition: % Unlike ghosting, the slow fade is a more gradual way of cutting off communication with someone you're seeing.

定义：与如鬼魅般消失不一样，慢动作消失指的是你约会的对象慢慢地斩断跟你的联系。