The process of annealing consists ofheating the steel to an elevated temperature for a definite periodof time and, usually, cooling it slowly.
退火工艺的组成为把钢加热到一定温度并保持一段时间，通常再缓慢冷却。
2
The principle was established with designing the capability ofheating equipment according to the peak heating load in greenhouse and deciding fuel store by total heating load in a periodof time.
The much-publicized hole in the protective tiles covering the shuttle's underbelly did not impact the vehicle's reentry and no unusual conditions were reported during the periodof maximum heating.