AGING: the process of running product through low temperature air draw furnaces for the purpose of relieving stress which was caused in the hardening operation.
时效处理：指让产品通过低温通风炉以释放淬火造成的应力的工艺。
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Breathing particulate-laden (aka smoggy) air may be hardening your arteries faster thannormal, according to research published recently in PLOS Medicine.