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。

　　274. While attaining world peace remains within the realm of possibility , the prevailing trend revolves around regional conflicts and internal strife in many countries .

　　获得世界和平是有可能的，但是普遍的趋势是存在地区冲突和许多国家内部的斗争。

　　275. Although statistics are quite often far less reliable than one might wish , other reliable information allows one to closely approximate industrial output figures .

　　尽管数据经常比人们希望的不可靠得多，但是，其他可靠的信息使人们能得到接近工业产量的数字。