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unknown <adj.> 未知的，不出名的
un- 表否定的前缀
eg. unlike 不喜欢 unlucky 不幸运
be unknown to sb. 不为人所知的
eg. He was an unknown painter one year ago. 一年前，他还是一个不为人知的画家。
Its missing head happened to be among
remains of the fifth century B.C.
happen to 偶然, 碰巧（强调事情的偶然发生）
-- I happen to meet him.
-- He happened to find the money in his pocket.
It happens that +从句
It happened that I met her on my way to work.
= I happened to meet her on my way work.
Sth happen to sb: 某人发生什么是（不好的事）
What happened to hin?
An accident happened to him.
Preserve: pre-在…前 serve
在变质之前保存下来
区别conserve [kən’sə:v]/preserve/reserv
节约:it’s important to conserve energy.
防腐：preserved body 木乃伊 preserved fruits 蜜饯
预留：Please reserve a seat for me.
