let-down heat exchanger 减速热交换器
blow-down heat exchanger 放水热交换器
let down heat exchanger 下泄热交换器
exchanger let-down heat 放出式热交换器
down heat exchanger
下热交换器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
At Mach 4 or 5, the air flow would become dangerously hot but this heat exchanger - consisting of a dense and closely-guarded bundle of tiny tubes - would chill things down to a manageable temperature in milliseconds.
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