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1·Kangaroos harbour a vast range of parasites.

袋鼠身上有各种各样的寄生虫。《柯林斯英汉双解大词典》

2·These symptoms may be referable to virus infection rather than parasites.

这些症状也许是由病毒感染引起的，而与寄生虫无关。《牛津词典》

3·Parasites are usually smaller than their hosts.

寄生虫通常比它们的宿主小。

4·Natural selection favors the parasites that are best able to find and feed on hosts.

自然选择偏爱那些最容易找到寄主并以之为食的寄生虫。

5·In nature, itching and scratching help animals get rid of parasites, plant material, or other unwanted baggage.

事实上，骚痒和抓挠帮助动物去掉寄生虫、植物体或其它不想要的垃圾。

6·Animals have parasites or carry a variety of viruses. Once transmitted to humans, it would be a very troublesome thing.

动物有寄生虫或携带各种各样的病毒。一旦传染给人类，这将会是非常麻烦的事。

7·Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems.

那些更容易感染疾病和寄生虫的男性将不得不使用他们的类胡萝卜素来增强他们的免疫系统。

8·It's possible that the cleanest and most highly evolved creatures where this topic is concerned are internal parasites, along with bee, wasp and ant larvae.

在这个话题中，最干净、最高度进化的生物可能是体内寄生虫，以及蜜蜂、黄蜂和蚂蚁幼虫。

9·Laboratory tests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins.

实验室测试表明，这些千足虫体内的分泌物富含两种化学物质，这两种物质是有效的驱蚊剂，而蚊子携带的寄生虫会削弱卷尾猴的能力。

10·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。

寄生虫

1·Kangaroos harbour a vast range of parasites.

袋鼠身上有各种各样的寄生虫。《柯林斯英汉双解大词典》

2·Natural selection favors the parasites that are best able to find and feed on hosts.

自然选择偏爱那些最容易找到寄主并以之为食的寄生虫。

3·In nature, itching and scratching help animals get rid of parasites, plant material, or other unwanted baggage.

事实上，骚痒和抓挠帮助动物去掉寄生虫、植物体或其它不想要的垃圾。

4·Animals have parasites or carry a variety of viruses. Once transmitted to humans, it would be a very troublesome thing.

动物有寄生虫或携带各种各样的病毒。一旦传染给人类，这将会是非常麻烦的事。

5·Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems.

那些更容易感染疾病和寄生虫的男性将不得不使用他们的类胡萝卜素来增强他们的免疫系统。

寄生生物

1·Saliva and other secretions from these parasites may cause itchy hypersensitivity reactions with the surrounding skin releasing histamine and other substances that cause itching and inflammation.

唾液和其它分泌物从这些寄生生物也许导致导致发痒和炎症的痒的过敏症反应与周围的皮肤发布氨基酸和其它物质。

2·In particular, the large and rich colonies of honeybees are a very rewarding target for a great variety of predators and parasites.

在自然界中，动物所面临的生存威胁主要来自于捕食者和寄生生物。

3·When will new predators, parasites and competitors also move in?

新的捕食者、寄生生物、竞争者何时能够到达？

4·T cells play a key role in recognising foreign invaders such as bacteria, viruses, parasites, or tumour cells.

T淋巴细胞在熟悉别异物上饰演一个关头脚色，它可以识别细菌、病毒、寄生生物或者是肿瘤细胞。