We have four levels of heating and four levels of cooling that include low, medium, high and very high.

我们有四级冷调及热调系统：低、中、高及超高。

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Up to that point, phones came in three basic categories: low, medium and high.

FORBES: Magazine Article

The researchers classified the embryos as low, medium or high risk of chromosome abnormalities based on their development at certain key points.

BBC: IVF 'may be boosted by time-lapse embryo imaging'

For example, shows can be watched in one of four video-quality levels (low, medium, high or auto), but people might not know what their network is capable of playing.

WSJ: For Live TV on the Go, Aereo Is Impressive But Limited