Definition: a long, low sound such as one expressing pain, unhappiness, etc. Level: C2
当她试图站起来时，一声低沉的呻吟从她唇边逸出。
A low ___groan escaped her lips as she tried to stand up.
随着一声绝望的呻吟，他瘫倒在沙发上。
With a desperate ___groan, he collapsed onto the sofa.
旧地板在重压下发出了一声呻吟。
The old floorboards let out a ___groan under the weight.
