这个小问题一直困扰着我，让我无法集中注意力。

This small issue ___niggles at me and makes it hard to focus.

他对新手机有些小抱怨，比如电池续航不够长。

He had a few ___niggles about the new phone, like the battery life being too short.

尽管她已经准备充分，但心里还是有一丝不安。

Despite being well-prepared, she still had a ___niggle of unease.