Blood cholesterol needs to be controlled through a healthy diet and, if necessary, by appropriate medications.
需要通过健康饮食控制血胆固醇，如有必要，则需适当服药。
If necessary, means must be provided to ensure that the machinery can be controlled only from control positions located in one or more predetermined zones or locations.
如有必要，必须提供确保仅能从一个或多个事先确定的区域或位置控制机械的方法。
It's necessary to face up the nature of life and death, which could not be controlled by any forces over nature and reality.
必须正视生死自然，人类个体的生死没有任何超自然、超现实的力量可以操纵；
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