It's a pity that he can't come.是什么意思？

It's a pity that he can't come.

很遗憾他不能来。

pity

n. 怜悯，同情，可惜的事，憾事；vt. 对…表示怜悯，对…感到同情；

例句
It seems such a pity that a distinguished and honored name should be commercialized in such a manner...
一个著名的、令人尊敬的名字被人用得如此商业化，似乎太让人遗憾了。

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

come

vi. 来，开始，出现，发生；vt. 做，装扮…的样子，将满（…岁）；int. 嗨！；

例句
I've come looking for a bit of advice.
我特来讨教。