计算公式为：目标心跳次数区域=220—年龄×（60%〜85%），它并不是一成不变的，可以根据健身者的锻炼目标和身体状况来决定。

The formula for obtaining a target heart rate equals 220 minus your age x 60% - 85%, depending on the individual's fitness goals and physical condition.

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油田开发过程中，对油藏的认识不是一成不变，也不可能一劳永逸，需要不断地对油层发育状况进行再认识。

The understanding of the reservoir is not constantly unchanged during the process of oilfield exploration, so the status of reservoir development must be recognized.

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