The sea of hatred [regrets] is hard to fill up.
恨海难填。
The fill in problem for graphs is a well known NP hard problem.
图的最小填充问题是熟知的NP-困难问题。
Because the room is very hard to cancel, please fill in this form carefully.
由于酒店房间很难取消，请谨慎填写此回执表。
It is so hard for a little bird to fill the sea up in such a way!
一只小鸟想用这种办法填平大海，真是谈何容易！
Fixed: Very Hard To Fill An Empty Jar Again From a Water Source.
修正：很难填补一个空罐子再次从水源。
Fixed: Very Hard To Fill An Empty Jar Again From a Water Source.
修正：很难填补一个空罐子再次从水源。
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