Diagram showing how supplying a city with good water lessens sickness and death. 伯莎M.克拉克.科学通论.
The tendency of iron to rust lessens its efficiency and value, and many devices have been introduced to prevent rusting. 伯莎M.克拉克.科学通论.
The tax made upon the nervous system by the defective eye lessens the supply of energy available for other bodily use, and the general health suffers. 伯莎M.克拉克.科学通论.