These complexes are formed from two antibodies, one antibody binds to a tumour marker, the other with a T-cell.

这种复合体由两种抗体组成，一种抗体结合一个肿瘤标记物，另一种抗体结合T细胞。

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The CD4 + test directly measures the abundance of the helper t cell, an of immune cell in the bloodstream distinguishable because they are the only ones that carry the CD4 marker.

CD 4 +试验直接检测辅助型T细胞数量。辅助型T细胞是血流中可分辨的免疫细胞中的一种，因为只有他们才具有CD 4标志物。

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In addition, it can down-regulate the expression of some special surface marker, such as CD25 and HLA-DR, on the activated t lymphocytes.

另外，它还能下调活化t淋巴细胞上一些较特异的表面标记CD 25和HLA - DR的表达。

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I lost my black marker but that doesn't matter.

我找不到黑色的笔了不过没关系

耶鲁公开课 - 聆听音乐课程节选

Suppose that there were some sort of genetic marker and, although we didn't have a tattoo that you would just have to look at, -- but you could have genetic counseling-- have your DNA examined and you could tell, if you had the DNA testing, how much time you had left.

假设有某种基因标记，虽然我们没有,让你不得不去看的在身上的标记了，但你可能会去做基因咨询-,检查你的DNA，如果你做了DNA化验的话，你就能知道自己还剩多少时间。

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But its manager, Richard Earnest, admits even he isn't as patient as Marker.

FORBES: 2004 Fund Survey

Certainly, Marker's system doesn't guarantee that a fallen angel will pick itself up off the floor.

FORBES: Timing Is Everything

Several are the subjects of motion to regret - which don't actually stop them but put down a marker if problems arise later.

BBC: Week ahead