Xïnkû le. So much toil for you.

Example 1:
A: Zuótiän wânshang wômen göngzuò le yí gè töngxiäo.
B: Xïnkû le! Kuài huíqù xiüxi ba.

A: We worked all through the night last night.
B: So much toil for you! Go back and have a rest now.

Example 2:
A: Lâoshï, zhège xuéqï nín xïnkû le.
B: Ï, bié zhème shuö, yïnggäi de.

A: Teacher, it’s been so much toil for you this semester.
B: It’s nothing really. I’ve done what I’m supposed to.

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The word Xïnkû le is used to comfort and show understanding for the person who has put great effort into something meaningful and positive.

Synonymous Expressions
Shòulèi le. ( shòulèi = be put to much trouble.
e.g. Jiào nín shòulèi le. - I'm sorry to have put you to so much trouble.)