科学家观察到蚂蚁用上唇将食物颗粒推向口器。

Scientists observed the ant using its ___labrum to push food particles toward its mouthparts.

医生说他肩膀疼痛是因为关节盂唇轻微撕裂。

The doctor said his shoulder pain was caused by a small tear in the ___labrum.