明确表明这些新生物的影响很困难。
Charting the impact of these newcomers is difficult.
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结论：III是新生物碱。
Conclusion: III is a new alkaloid.
微生物学是新生科学。
Microbiology was a newborn science.
新生血管的形成是肿瘤生长和转移表达肿瘤生物学特征的基础。
New vessels is the base of the growth and metastasis of tumor.
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