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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It seems to have been used first in documents of the 5th century B. C. to describe a small territory at the tip of the boot-shaped peninsula that extends into the Mediterranean Sea.

它最早被用在公元前5世纪的文件中，指的是延伸进地中海的靴形半岛顶端的那一小块领土。

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