咖啡机开始发出奇怪的声响，然后突然噗噗地喷出蒸汽。

The coffee machine started ___spluttering before suddenly releasing bursts of steam.

她非常沮丧，只能结结巴巴地说出几个断断续续的词。

She was so upset that she could only ___splutter out a few broken words.