C/N ratio can be taken as a rooting index of elm tip.

碳/氮比率可作为白榆新梢生根的指标。

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Tip: Check your argument for chains of consequences, where you say "if a, then b, and if b, then c," and so forth. Make sure these chains are reasonable.

技巧：检查你论证中的事件链条，在你说“如果A则B，如果B则C”的地方，确定该系列事件能够合理的发生。

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Aim: to study the effects of cordyceps polysaccharide on micronucleus of Vicia faba root tip cells caused by mitomycin-c (MMC).

目的：研究虫草多糖对丝裂霉素诱发的蚕豆根尖细胞微核的影响。

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