cold hot中o发音不一样:

/əu/，/ɒ/

it's cold. you should wear a sweater . 天冷了，你应该穿毛衣。

It 's getting cold. we 'd better start wearing our padded jackets . 天冷了，棉衣该上身了。

His voice was hard and cold. he spoke with deliberation . 他的声音生硬而又冷淡，而且是字斟句酌地说着。