These are all examples where CPR with mouth-to-mouth breathing may be more helpful that hands-only CPR.

VOA: special.2009.06.09

To disfigure the mouth -- this is how I would interpret it -- to disfigure the mouth has a primary effect in rendering one at least temporarily speechless.

把嘴巴丑化--这就是我所理解的-,丑化自己的嘴巴使自己暂时不能说话,它是有十分重要影响的。

耶鲁公开课 - 弥尔顿课程节选

Here's one climbing out of the pool: First her face appeared, long and cadaverous, with a bandage-like bathing cap coming down almost to her eyes, and sharp teeth protruding from her mouth.

有一个女人从游泳池中出来了，首先是她的脸，修长,而惨白，如绷带般的泳帽从她的头部,耷拉到她的眼睛，锋利的牙齿从她的口中突出。

耶鲁公开课 - 1945年后的美国小说课程节选

Because there are many of these cases, people should still learn CPR with mouth-to-mouth.

VOA: special.2009.06.09

Even if you cannot do mouth-to-mouth rescue breathing, you can perform hands-only CPR.

VOA: special.2009.08.11

He says some victims, including babies, need the mouth-to-mouth breathing with the compressions.

VOA: special.2009.08.11

"I can do things that are good for me,you know, not just try to exist hand-to-mouth or in survival mode,you know?

VOA: standard.2010.02.23