身处象牙塔里，他们并不真正懂得毒品犯罪多么有害。
They don't really, in their ivory towers, understand how pernicious drug crime is.
要想真正懂得学习英文的目的，学35年。
To truly understand the purpose of English learning, one has to do it for 35 years.
如果你懂得了农业，那你就真正懂得了穷人的经济学。
So if we knew the economics of agriculture, we would know much of the economics of being poor.
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