不论对细胞DNA合成的促进作用还是抑制作用，三价砷比五价砷的作用更强。

The effects of stimulating or inhibiting of trivalent arsenic on DNA synthesis were always stronger than that of pentavalent arsenic.

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磷的磷的，有关磷的，或含磷的，尤指含五价磷的，或比类似的磷化物价更高的。

Of, relating to, or containing phosphorus, especially with a valence of5 or a valence higher than that of a comparable phosphorous compound.

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概括了几种常用的三价和五价碘试剂作为氧化剂氧化醇的研究进展，并对相应的氧化机制进行了探讨。

Advances in the oxidation of alcohol promoted by I (III) and I (v) reagents are reviewed and the relevant mechanisms are discussed as well.

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