We remember a blood stain.

我们记得斑斑的血渍。

youdao

Finding a blood stain on surfaces is harder than it sounds.

在物体表面找寻血迹比想象中可要难多了。

youdao

Called a CellScope, it can show individual white and red blood cells, which means that with the correct stain it can be used to identify the parasite that causes malaria.

这种器件被称为细胞观察器，它可以单独将白细胞与红细胞呈现眼前，这就意味着只要加入适当的生物染料就可以用来确定引致疟疾的寄生生物。

youdao