thorn

她那个爱抱怨的邻居一直是她生活中的一根刺。

Her complaining neighbor has been a constant ___thorn in her life.

小心别被黑莓丛上的尖刺划伤。

Be careful not to get scratched by the ___thorn on the blackberry bush.

她在采摘野花时不小心被一根尖刺扎伤了手。

She accidentally got her hand pricked by a ___thorn while picking wildflowers.