He crept into the corner, mouthing curses.

他悄悄移到角落，嘴里喃喃诅咒着。

He was mouthing off about the high price of fish.

他就鱼价飞涨大发议论。

He was mouthing the usual platitudes about the need for more compassion.

他言不由衷需要更同情之腔滥调。