How best to keep birds and planes apart?
怎样最好地使鸟和飞机分开？
It's her job to find a way to keep birds and planes apart.
她的职责就是要想办法不让飞鸟和飞机撞到一起。
The best solution is to keep birds and planes away from each other.
最好的办法是保持鸟和飞机彼此分开。
Birds must have faith that food is available somewhere, so they keep searching.
飞鸟必须有这样一个信心，相信在某个地方会有合适的食物，因此它们会寻找。
Birds swell their feathers with air in order to keep warm.
鸟类的羽毛能凭空气扎煞起来以保暖。
Birds sit on their eggs to keep them warm.
小鸟是站在它们的蛋上来给它们的蛋保暖的。
Birds' screaming is usually enough to keep an outsider away.
鸟类的尖叫声通常已经足够把外来者挡开。
Birds' screaming is usually enough to keep an outsider away.
鸟类的尖叫声通常已经足够把外来者挡开。
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