We knew all along but didn't have the heart to tell her.

我们一直都知道，但是不忍心告诉她。

《柯林斯英汉双解大词典》

Finally, I didn't have the heart to refuse.

最后，我也无意拒绝了。

youdao

I just don't have the heart to tell him the bad news.

我实在不忍心告诉他那个坏消息。

youdao

The hopeful women were also thirty percent less likely to have died from heart disease after the eight years.

VOA: special.2009.04.15

The muscles of the heart have to give blood themselves so they have blood vessels inside.

心肌自身也需要血液,所以在这些肌肉内部也有血管

耶鲁公开课 - 生物医学工程探索课程节选

Some of them have to do with merely digesting food and moving the body around, and making the heart beat,and the lungs open and close.

有一些只负责消化食物或者身体活动，让心脏跳动，让肺部呼吸。

耶鲁公开课 - 死亡课程节选

The deeply disgruntled workforce did not have the heart to stage them.

BBC: Trotting in Rome: Farewell to a sporting way of life

Although this workshop represents a major step forward in the dialogue about open science, the flyers at home were out and I did not have the heart to cancel on the librarians.

FORBES: A Plea For Open Science In Medicine

Campbell had looked so pleased over her thoughtfulness for me that I simply did not have the heart to tell her that nothing would have shocked my father more than the idea that I was wearing mourning for him at all.

NPR: Excerpt: The Sherwood Ring