I had them check for other foreign substances.

我让他们再查查其它杂质。

These are specialized classes of proteins that identify and fight foreign substances, like viruses.

这些是特殊类别的蛋白质，可以识别和对抗外来物质，如病毒。

(5). Removal of metabolic waste products and foreign substances from the plasma.

(5)。清除血浆中的代谢废物和外来物质。

These molecular traces on the surface of pathogens and other foreign substances betray the presence of invaders.

病原体和其他外来物质表面的这些分子痕迹暴露了入侵者的存在。

Leukocytes are mainly responsible for protecting the body from bacteria and other potential harmful foreign substances.

白细胞主要负责保护身体免受细菌和其他潜在的有害外来物质的危害。

The groundwork of the face was hopefulness; but over it now I ay like a foreign substance a film of anxiety and grief.

这原本是一张充满希望的脸；但现在却蒙上了一层焦虑和悲痛的陌生神情。

The skin is the largest of the body's organs. It keeps out foreign substances and prevents excessive water evaporation.

皮肤神经提供触觉信息，皮肤还有助于保持人体气温在37°的水平，其既可以减少皮肤血流量来保存热量，也可以增加皮肤血流量和汗水蒸发量来散出热量。

Leukocytes protect us against foreign substances. Some engulf foreign material by the process of phagocytosis;others function as part of the immune system.

白细胞保护我们免受外来物质的侵害。有些是通过吞噬过程吞噬异物;其他的细胞作为免疫系统的一部分参与。

It normally starts when a foreign substance, oftentimes bacteria, makes its way inside the leptomeninges, either by by direct contact or hematogenous spread through the blood brain barrier.

它通常由于异物，有时是细菌，进入柔脑膜；可能是通过直接接触或透过血脑屏障进行血性传播。

First off, like Ethanol, Fructose is not necessary to the body so it's treated like a foreign substance and almost 100% of it is processed in the liver.

首先，和乙醇一样，果糖对身体来说不是必要的物质，所以（尤其是果糖不耐受人群）几乎 100% 都是在肝脏内代谢的。

If the body comes into contact with the allergen again, these antibodies—which are proteins designed to attach to foreign substances and remove them from your body—will start a reaction to fight against it.

如果身体再次接触到过敏原， 这些抗体— — 它们是一种蛋白质，旨在附着在异物上并将它们从你的身体中清除— —会开始反应来对抗它。

Kind of like how we're better at learning foreign languages when we're younger, our immune systems are best at learning to distinguish harmless foreign substances from harmful ones when exposed to them very early in life.

有点像我们年轻时比较擅长学习外语一样，我们的免疫系统在很早的时候接触到无害的外来物质时，最擅长学习区分无害的外来物质和有害的外来物质。

The answer is that it hitches a ride in your circulatory blood stream, cycling through your body in a race to do its job before it's snared by organs and molecules designed to neutralize and expel foreign substances.

答案是它搭上了你的循环血流的便车，在它被旨在中和和排出异物的器官和分子诱捕之前，在你的身体中循环完成它的工作。