So is the microscopic examination for blood corpuscles. The latter is valueless if the stains are a few hours old.

用显微镜检验血球的方法也同样不好。如果血迹已干了几个钟头以后，再用显微镜来检验就不起作用了。

We only exist as the blood corpuscles that course through its arteries, and if it could work without us, it would let us die.

我们存在着，只不过像流过它的大动脉的一些血球，要是它没有我们也能工作的话，它就会让我们死掉。