Noun:

1. a mixture of substances (usually salt and ice) to obtain a temperature below the freezing point of water

freeadj.自由的；免费的；畅通的；没有…的；未使用的；空闲的；随意的v.释放；使自由；使摆脱；解除；使可用于(某目的)adv.免费地；自由地free word自由词