它资源丰富，既可免费使用，又无需运输，对环境无任何污染。
It is rich in resources, both free, and no transport, no pollution to the environment.
运输安全管理局可以采取一项无需改造机场或急聘员工的措施：将更多人纳入预检计划。
There is one step the TSA could take that would not require remodeling airports or rushing to hire: Enroll more people in the PreCheck program.
环保主义者称，因为无需包装和运输，直饮水要比瓶装水少消耗300倍能源，而且不制造垃圾。
Environmental activists argue tap water USES around 300 times less energy than bottled water for its packaging and transport and leaves nothing for disposal.
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