Normally the immune system protects the body by identifying and destroying foreign invaders like bacteria, viruses or toxins.

正常情况下，免疫系统可以通过识别并清除细菌、病毒、毒素等入侵物保机体。

" The end goal is still a 5,000-square-mile wildlife reserve," says Alison Fox, who took over as APR's CEO in 2018.

“最终目标仍然是5000平方英里野生物保”，2018担任美国草原保执行总裁艾莉·森福克斯说。

These epithelial cells produce keratin, a protein that makes the layer tough, and protects against normal wear and tear from food and drinks.

这些上皮细胞产生角质，一种让这层结构变得坚硬质，能保黏膜免受饮食物磨损。

The arrest took place during a traffic stop, not far from the wildlife refuge. A further two men were held at a separate location.

逮捕行动发生在距离野生物保远处一个交通路口，另外两人在另一地点被捕。

But unless these systems have adequate security protection, the internet of things could easily become the internet of new things to be hacked.

但除非这些系统有足够安全保，否则物联网很容易成为被黑客入侵新事物互联网。

For instance, we can use soil from the moon to create shielding to protect us from solar radiation, that'll make our colonies much safer.

例如，我们可以用月球上土壤来制造屏蔽物，保我们免受太阳辐射，这将使我们殖民地更加安全。

That's why every muscle contains a few different kinds of supportive sheaths of connective tissue -- the protective reinforcements to keep that bulging muscle from bursting.

这就是为什么每一块肌肉都包含几种同类型结缔组织支持鞘——保增强物，以防止膨胀肌肉爆裂。

As you can see, track ballast not only protects the railway track and its sleepers from the forces of nature and the stress of a moving train, but also adds to the overall comfort of passengers.

正如你所看到，轨道压载物仅保铁路轨道和枕木免受自然力量和移动火车压力，而且还增加了乘客整体舒适度。