The two main kinds of antigens, A and B, determine your blood type.

不会误以来物， 而加以攻击。

Over the years, scientists have analysed these meteorites and determined their age through radioactive dating.

近年来，科学家们分析了这些来物通过放射性同位素衰减测其年龄。

Birds eat the seeds of invasive plants and spread them to other places.

鸟类会吃掉来入侵植物物的种子，传播到其他地方。

In many cases, train workers have to remove foreign objects from overhead lines manually.

在大多情况下，铁路工作人员必须手动从接触网清除来物。

Her body was fighting a foreign invader, and she wasn't getting any help.

她的身体在抗击一种来物的入侵，而没有人给她任何帮助。

And because they're part of our bodies, the liver is less likely to label them as foreign.

因它们我们身体的一部分，肝就更不可能会把它们当成来物。

Those chemical markers can identify foreign bodies like pathogens-small organisms, such as a virus or bacteria, that can cause disease.

那些化学标记能够识别来物，例如病原体——能够引发疾病的小型有机物，例如病毒或。

The bigger the foreign object, the harder it is to clean it up. Bird nests are one of the most difficult.

异物越大，清理起来就越困难，鸟巢最难清理的来物之一。

Burnett went on to lay out how the body learns to identify foreigners.

伯内特进一步解释了身体如何学会识别来物。

The body identifies those fragments as foreign and responds by producing compounds called antibodies, tailor-made to match the antigens.

身体识别这些片段来物，并通过产生称抗体的化合物来作出反应，这些抗体量身定制以匹配抗原的。

I like my body where I'm kind of like, if it ain't broke, so I don't want to introduce a foreign object to my body and throw the system off.

我喜欢我现在的身体状态，如果它没坏， 我就不想引入来物干扰， 以免打乱身体的平衡。

8 If immunity is not altered during pregnancy the foetus will be recognized as foreign and this will elicit an immune reaction against the baby that would end the pregnancy.

如果在怀孕期间免疫系统没有发生变化，胎儿将被视来物，这将引发针对婴儿的免疫反应，从而终止妊娠。

Typically you get some pus around it, some inflammation, and that pus and inflammation is part of the process of isolating that foreign intruder, that splinter, and then eventually creating some tissues that extrude it.

通常你会在伤口周围发现一些脓液和炎症，这些脓液和炎症隔离那来入侵物， 也就木刺的过程的一部分，最终会形成一些组织将其排出。