adj. 为琐事操心的；过于精细的；琐碎的
n. 过于琐碎的工作；无关紧要的事
v. 挑剔（niggle 的 ing 形式）
1.She still felt the same niggling doubt: was he really telling the truth?
她仍然无法消除萦绕心头的疑虑：他真的说实话了吗？
2.She still felt the same niggling doubt: was he really telling the truth?
她仍然无法消除萦绕心头的疑虑：他真的说实话了吗？
3.Jack is niggling at bones.
杰克(狗)正在啃骨头呢。
4.The matter is too small to be worth niggling over.
小小不言的事，不必计较。
5.She had niggling doubts about their relationship.
她时常对他们的关系有一丝疑虑。
6.Something was niggling her.
她有点烦心的事儿。