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.

youdao

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.

youdao

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.

youdao