无人机操作员必须确保飞机能够飞回家,而不需要其他飞机的干扰。
UAV operators must ensure that aircraft are able to fly home without interfering with other aircraft, it says.
理想状态下,你希望你的计算机能够陪伴你4年的大学时光。 但是如果你不需要当前市场上最快的机器,那么就不要购买它。
Ideally you'd like your computer to last you the four years you're at college, but if you don't need the fastest machine on the market don't get it.
与此同时,养护它们不用带泥的事实,同样使它们有资格成为世界最不需要种植者照料的植物之一——当人们对这种植物的生理机能有了个基本认识。
Together with the fact that there is no soil to contend with, they also qualify as one of the world most care free plants for growers-when one has a basic understanding of how the plants function.
It turns out there's actually no natural function known in the body for lithium.
事实上我们已知的身体机能,在正常情况下根本不需要锂。
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