People with low Vitamin D level are more susceptible to infection.
维生素D含量比较低的人更容易生病。
The average level of vitamin D was found at 35.7 nmol/L.
研究发现，维生素D的平均浓度为35.7nmol/L.
Are you willing to compete at the Ph. D. level?
你愿意在博士级别竞争么？
The level of D-dimer was no significantly difference in the two groups(P>0.05).
D-二聚体水平在两组间差异无统计学意义（P>0.05）。
The level of D-dimer was no significantly difference in the two groups(P>0.05).
D-二聚体水平在两组间差异无统计学意义（P>0.05）。
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