The rest are all hitch-hikers, mainly harmless bacteria that have evolved with us.

其它的都是搭便车的生物，主要是一些与我们共生的无害细菌。

youdao

We also realize that hiking can be hard work and believe that hikers need all our help.

我们知道长途跋涉很艰难，我们也确信旅行跋涉者需要帮助。

youdao

No one should ever encourage a wolf or any other wild animal to approach, and hikers and campers should take all necessary precautions to prevent mishaps involving wildlife.

所以我们禁止接触狼和野生动物。那些旅行者更得要做好野外旅行的保护措施。

youdao

No facilities are available en-route and hikers must carry all necessary equipment, medical kits, food and water.

BBC: Hiking Namibia��s Fish River Canyon

For sportsmen wanting to get into the backcountry, Blanket Bay arranges helifishing excursions to areas inaccessible to all but the most determined hikers.

FORBES: "We Weren't Hut People"

This in turn draws boaters, anglers, hikers, birdwatchers and all the employment-boosting businesses that serve them.

ECONOMIST: American waterways