本特利冰河下沟谷 Bentley Subglacial Trench

上下沟通 Employers and Employees ; Bottom -u pcommumication

额下沟 inferior frontal suleus ; [解剖] Sulcus frontalis inferior ; sulci frontalis inferior

颞下沟 inferior tempotal suleus ; [解剖] Sulcus temporalis inferior

鳃下沟 hypobranchial groove

下沟队 lowering in crew

眶下沟 [解剖] infraorbital groove ; infraorbital sulcus ; Semilunar curve

向下沟通 downward communication

下沟拖拉机 lowering in tractor