Translation of "Couldn’t" in Chinese

Seeing this scene, I couldn’t help but sigh.

看见这副景象，我不禁叹了口气。

There couldn’t be a more ideal solution than that.

再没有比这更如意的办法了。

When I thought of that, I couldn’t help smiling.

想起这些，我忍不住要笑。

The excited children couldn’t go to sleep all night long.

这些兴奋的孩子整个晚上无法入睡。

He had to be responsible, but this was a responsibility that he couldn’t bear.

他要负责任，这责任可担待不了。

For some reason I couldn’t select unifont even though I’ve installed it, so I had to build dmenu with the xft patch to get Chinese menu entries displayed correctly.

为奇怪的原因，我不能选择了unifont，即使我已经安装了，所以我需要做了用xft的补丁dmenu正确的代表中文的条目。