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269. Unfortunately , available evidence fails to establish any direct link between smoking and cancer . 不幸的是，现有的证据不能证明抽烟和癌症之间有直接的联系。 270. Fortunately , mountains of reliable evidence proves the direct link between smoking and cancer beyond any shadow of the doubt . 庆幸的是，大量可靠的证据证明抽烟和癌症有直接联系是毫无疑问的。 271. Television violence has contributed directly to rising crime , as evidenced by statistics showing a dramatic rise in copycat crimes . 数据显示模仿的犯罪行为有大幅度的增加，这证明电视暴力是犯罪增加的一部分直接原因。 272. The introduction of adcance agronomic techniques has contributed greatly to the development of agriculture , as indicated by statistics showing increased output in each of the past five years . 数据显示在过去的五年中，每一年的产量都有提高，这表明发达的农业技术的引入对农业发展起到了很大的作用。 273. While it may appear that the gap between rich and poor people is narrowing somewhat , recently released evidence suggests that the opposite is true . 贫富之间的差距看似有一定的缩小，但是最近发布的证据表明事实正好相反。 | 
