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Cryogenic temperature
Cryogenic
Hot treatment: vacuum, carburizing, nitriding, vacuum heat treatment and cryogenic treatment etc.
For example, it must be kept very very cold at minus 253 degrees Celsius.

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Open the tool →超低温 (chāo dī wēn) means “Ultra-low temperature, Cryogenic temperature, Cryogenic”.
超低温 is pronounced chāo dī wēn in Mandarin Chinese.
“Ultra-low temperature” is 超低温 (chāo dī wēn) in Chinese.
This page has 2 example sentences using 超低温, each with pinyin and an English translation.