想像一下你可以挥舞魔杖来提高世界农作物的产量，降低成本，使用更少的矿物燃料来种植庄稼并且减少由此带来的污染。
Imagine you could wave a magic wand and boost the yield of the world's crops, cut their cost, use fewer-fossil fuels to grow them and reduce the pollution that results from farming.
如果你还是不懂，那么就想象一下当你挥舞着铁锤恰到好处地正中要害，一锤定音，那种感觉有多美妙。
If you don't understand this, just think about that sweet feeling you get when you swing a hammer at a nail and hit it perfectly.
她看见杰夫挥舞着双臂。她又环视了一下四周，身后。
She looked at Jeff, who was waving his arms. She looked around, behind her.
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