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.