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1·As Heidi did not want to appear thankless, she replied sadly, I can't tell you.

因为海蒂不想显得忘恩负义，她伤心地回答：“我不能告诉你。”

2·Football referees have a thankless task.

足球裁判的工作费力不讨好。《柯林斯英汉双解大词典》

3·Sometimes being a mother and a housewife felt like a thankless task.

做母亲和家庭主妇有时使人觉得好像是个受累不讨好的差使。《牛津词典》

4·What a thankless child you are, just idle and good-for-nothing!

你真是个不知好歹的孩子，整天游手好闲，一无是处！

5·Why on earth should their beds be properly aired, seeing that they left them in such a thankless hurry?

既然他们是这样匆匆忙忙地走了，连吃力不讨好也不知道，为什么要帮他们把床铺晒干呢？

6·That's a thankless task.

那是吃力不讨好的事。

7·SAVING the world is a thankless task.

拯救世界是一个费力不讨好的任务。

8·Soccer referees have a thankless task.

足球裁判的工作吃力不讨好。

9·They seldom labour their wits on thankless task.

他们很少为吃力不讨好的工作动脑筋。

10·Thankless people fall in trouble, can't be saved.

忘恩的人落在困难之中，是不能得救的。