In vertebrates, the immune system provides a multiple defense against internal parasites.
在脊椎动物中，免疫系统提供了对体内寄生虫的多重防御。
They are parasites on America.
他们是美国的寄生虫。
Not any old parasites, either.
这次向疟蚊身上感染的也不是常见的寄生虫。
可这又干寄生虫什么事呢？
我们不能过寄生生活。
Did parasites drive human evolution?
寄生虫催使人类进化？
有寄生虫？
But they've got parasites to look out for too.
但是，他们也有许多需要照顾的寄生虫。
The parasites also have different effects.
再者，两种寄生虫产生的病征也不同。
They are also better able to fend off parasites.
他们抵御寄生虫的能力更强。
Do we want our children exposed to more parasites?
要让我们的孩子多暴露在有寄生虫的环境中？
Now, let me paraphrase that: You are parasites!
让我来解释这一切吧：你们都是寄生虫！
As a result, the parasites stopped reproducing.
结果，寄生虫停止了繁殖。
You are a parasites that invades the very host.
你是个寄生虫入侵的主机。
A more understandable phrase might be "parasites".
一个更清晰易懂的说法可能就是“寄生虫一族”。
People on others are usually regarded as parasites.
依靠别人生活的人通常被看做是寄生虫。
The strange thing is, they may have parasites to thank.
奇怪的是，入侵成功还得感谢寄生虫的帮忙。
A single stool sample for ova and parasites was negative.
一次大便找虫卵和寄生虫阴性。
Dogs are nice but the ticks and parasites on them are bad.
狗是很好的，但是他们身上的虱子和寄生虫是不好的。
Those who loaf all day and do nothing are social parasites.
饱食终日，无所事事的人是社会上的寄生虫。
Intestinal parasites are not spread from person to person.
人与人的接触不会传播肠道寄生虫。
These nine situations are like the 'parasites' of the army.
这九种弊病是祸害三军的蛀虫。
It's often easy to control the parasites with cheap treatments.
其实用一些价廉的治疗方法就可以很容易控制住这些寄生虫。
Maybe they are, but maybe that's because we made them parasites.
可能他们确实是，但却是我们造成的。
You rarely get a blood smear with hundreds of parasites obvious in it.
你很难在一个血液涂片上很明显得看到数百计的寄生虫。
You rarely get a blood smear with hundreds of parasites obvious in it.
你很难在一个血液涂片上很明显得看到数百计的寄生虫。
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