It's a pity.，It's too bad.，unfortunately，It is to be regretted that...，pity ；

[例句] 他把聪明都用在了犯罪上，太可惜了。 Too bad he used his intelligence for criminal purposes.

[例句] 别误会我的意思，这个工作很有意思，可惜不是长期性的。 Don't get me wrong, it's interesting work. But it's not permanent.

regrettable ；

[例句] 可惜的是，我们是两个世界的人。 But my world isn't your world, more's the pity.

[例句] 可惜的是，竹子开花后便会枯死。 Sadly, bamboo plants die after flowering.

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