The paper reports the hazard of much more content of Fe and Mn of water, the Fe-removing principle and result by natural Mn, operation caution and methods of extention service life.

分析了水中铁锰含量过多的危害，阐述天然锰砂的除铁原理、除铁效果、操作注意事项和延长使用寿命的方法。

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Even so, the researchers caution against Wusing these findings as support for more elective C-sections because that would result in numerous women having an operation they do not need.

虽然如此，研究者还是对支持这种观点者提出警告，因为这样会导致更多不需要手术的妇女进行手术。

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He sang the virtues of co-operation, caution and planning.

ECONOMIST: After the debates

However, Lorency said that Operation Compassion would be making fixes more out of an abundance of caution and the current regulatory climate.

FORBES: Charity Eyes Quarter-Billion-Dollar Write-Down In Value Of Goods Handled