Under F. A. A. guidelines, recreational fliers like Mr. Anderson and his customers must keep unmanned aircraft lower than 400 feet, away from other aircraft and within the operator's sight.
在联邦航空局的准则里有，像安德森先生和他的客户们娱乐飞行，必须使无人机在400英尺以下高度飞行，远离其它飞机而且在操纵者的视线之内飞行。
These verbs mean to keep from the sight or knowledge of others.
这些动词的意思是使别人看不到或不知道。
Hank: Yes, we must keep him on leash from now on. Farmers around here are likely to shoot on sight any dogs they catch worrying their sheep.
汉克：不错，由现在起，我们得牵着它。这里一带的农民，一见到豿儿骚扰绵羊，很可能会开枪射杀。
Hank: Yes, we must keep him on leash from now on. Farmers around here are likely to shoot on sight any dogs they catch worrying their sheep.
汉克：不错，由现在起，我们得牵着它。这里一带的农民，一见到豿儿骚扰绵羊，很可能会开枪射杀。
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