研究人员还发现，在那些受资助上学的女孩们当中，艾滋病传染比例低得多。这再一次证明了责任和自我控制的力量。
Researchers also found that rates of HIV infection were much lower among girls paid to stay in classrooms: one more lesson in the power of responsibility and self-control.
顺便提一句，大部分这里评估的研究都是奶制品行业资助的—但是他们还是证明不了这些奶制品有生产商花数百万美元所广告的效果。
By the way, most of the studies reviewed here were paid for by the dairy industry - and they still failed to show their products met the manufacturer's multimillion dollar advertising claims.
谁也不能证明交通事业就只能由交通收入来资助，同时能对负面对象征税（并借以减小其危害）的机会毕竟很少。
There is no specific reason why transport should be funded by transport revenues alone. But easy opportunities to tax—and thereby reduce—undesirable things are rare.
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