A little background noise is okay, but if you can hear another person speaking distinct words, the clip should be rejected. Typically this happens where the TV has been left on, or where there is a conversation going on nearby.
一定程度的噪音是可以接受的，但如果您听到录音中还有其他人在说话，则应驳回该录音片段。这种情况容易在身边开着电视，或附近有人在交谈时发生。