人类在地球上出现是偶然的吗？

Were the appearance of human beings on the earth occasionally?

偶然有个例外，也是歪瓜劣枣。

Occasionally there is an exception, but also distortion melon bad dates.

偶然读到一篇英文文章，讲的是蚂蚁。

Occasionally read an article in English, talking about the ants.

我喜欢无心插柳柳成荫的那种偶然。

I like the unintentional positive outcomes of the kind occasionally.

偶然把手放在她的头上使得她的胸部挺出。

Occasionally puts her hands above head to make her breasts stand out.