This special form of vitamin D is naturally present in breast milk.

这种特殊形式的维生素D天然存在于母乳中。

《柯林斯英汉双解大词典》

This form of vitamin D is naturally present in breast milk.

这种形式的维生素d天然存在于母乳中。

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The bacterium is naturally present in large Numbers in the intestine.

这种细菌大量地自然存在于肠道内。

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That DNA gets replicated to make many more copies of the viral DNA using host mechanisms, that is, often using the DNA polymerase which is naturally present in the host cell for its own replication.

病毒DNA进行复制,通常是利用在宿主细胞自身的有关物质,利用宿主细胞中天然存在的,DNA聚合酶来大量复制病毒DNA

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