But they are lack of relative knowledge.
但普遍缺乏营养知识。
The knowledge keeps changing. No "knowledge" on earth is absolute, all "knowledge" is relative.
知在变。世上没有绝对的“知”，只有相对的“知”；
Therefore, western mechanical knowledge relative to lever, specific and fluid was systematically introduced into China.
随之，包括杠杆、比重、流体等方面的西方力学知识比较系统地被介绍进来了。
Concept of the knowledge of project management and relative soft wares.
了解产品数据管理知识和常用软件。
Concept of the knowledge of project management and relative soft wares.
了解产品数据管理知识和常用软件。
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