This is due to the presence of relatively large amounts of blood present in the embryo during this stage.

这是因为此阶段有相对大量的血出现在胚胎中。

youdao

Purpose to find out the histopathological characteristics and the significances when blood present in the human lymph node sinus.

目的：探讨人淋巴结窦内出现血液成分的组织病理学特点及其意义。

youdao

It's also present in spinal fluid and, in very small quantities, in the blood.

这种蛋白同时也出现于脊椎液中，并且极小量存在于血液里。

youdao

But the writers of the report knew that the number of monocytes in the blood stream was too low to explain the millions of them present after an injury to the heart.

VOA: special.2009.08.25

If you looked at the antibodies that were present in the blood, for example, you would find that most of those antibodies are IgM during this initial period of antibody concentration rise.

如果你现在观察血液中存在的抗体,举个例子,在初次免疫的抗体浓度上升阶段,你将会发现大部分的抗体都是IgM

耶鲁公开课 - 生物医学工程探索课程节选