我国农村饮用水安全问题主要体现在水质差、水量不足、取水不便、不能保证供给等方面。
The present problems are mainly embodied in the bad water quality, not enough water quantity, inconvenient pick-up, no supply of safe water, and so on.
目前我国逆变焊接电源存在的问题主要体现在产品结构不合理、质量不过关和创新性不足等方面。
At present, there are some disadvantages such as unreasonable structure of product, inferior quality, insufficient of originality innovation and so on in the inverter welding power.
马克思的物质变换思想主要体现在人与自然关系问题上，强调的是人与自然以及人与人之间的物质变换。
Marx's ideas of material transformation are mainly embodied in the relation between man and nature, it stresses on the relation of man and nature and the material transformation among people.
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