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.

正如你所看到的，轨道压载物不仅保护铁路轨道免受自然的力量移动的火车的压力，而且还增加了乘客的整体舒适度。

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不同类型的结缔组织支持鞘——保护增强物，以防止膨胀的肌肉爆裂。

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护区不远处的一个交通路口，另外两人在另一地点被捕。

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，我们可以用月球上的土壤来制造屏蔽物，保护我们免受太阳辐射，这将使我们的殖民地更加。

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的蛋白质，能保护黏膜免受饮食物的磨损。

" 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平方英里的野生物保护区”，2018年担任美国草原保护区执行总裁的艾莉·森福克斯说。

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、毒素等入侵物保护机体。