有证据表明，公元前3000年以前，非洲就有了农业。
There is evidence of agriculture in Africa prior to 3000 B.C.
现在，我们确实有明确的证据表明，人们正在以一种以前不可能的方式发展友谊和专业网络，而且这个过程发展得更快了。
Now, what we do have clear evidence for is that people are developing friendships and professional networks in a way that wasn't possible before, the process is faster.
我们看到了比以前更多的严重病例，不过没有迹象表明病毒发生了变异。
We are seeing more serious cases than before but no sign of any change in the virus.
同时，美联储最新的贷款人员调查表明，虽然不如以前那么严格，但是美国银行从第一季度到四月份仍在继续紧缩借贷标准。
Meanwhile, the Federal Reserve’s latest loan-officer survey showed that American banks continued to tighten lending standards in the three months to April, although not quite as sharply as before.
同时，美联储最新的贷款人员调查表明，虽然不如以前那么严格，但是美国银行从第一季度到四月份仍在继续紧缩借贷标准。
Meanwhile, the Federal Reserve's latest loan-officer survey showed that American Banks continued to tighten lending standards in the three months to April, although not quite as sharply as before.
1999年，一头两岁的象海豹在这个海滩上被拖上岸来，它身上有一个标牌，表明它以前曾在西北方向2 500英里外的另外一个岛上被人发现过。
In 1999 a two-year-old elephant seal was hauled out on this beach bearing a tag which identified it as having been previously spotted on another island 2,500 miles northwest.
马西里海山四周分布的物质表明，这里以前曾发生过一些小规模的崩塌。
The distribution of material around Marsili hints that smaller collapses have occurred there before.
以前的研究已经表明，茶具有健康的抗氧化性，和高含量的类黄酮，降低了患某些癌症和心脏病的风险。
Previous research has already linked tea's healthy antioxidant properties and high flavonoid content to cutting the risk of some cancers as well as heart disease.
以前，没有可视化的指示表明一个模块调用了另一个模块中的组件，或者哪些模块对哪些库具有依赖性。
Previously, there was no visual indication that one module invoked components from another module, or which modules had dependencies to which libraries.
以前研究表明这个变异体与标新立异行为、偏食、毒隐和ADHD有关联。
Previous work has shown that this variant is associated with novelty-seeking, food- and drug-cravings, and ADHD.
这种理论表明氢原子可以塌陷到一种以前从未被发现的次氢形态，并释放出能量。
This states that a hydrogen atom can collapse into a previously unknown form called a hydrino, producing energy.
研究结果表明非洲的卫生人力短缺问题比以前估计的要严重得多。
Our results suggest that the health workforce shortage in Africa is even more critical than previously estimated.
因此，虽然基因在泛自闭症障碍中起了重要作用，但是似乎比以前研究表明的重要性要小。
Thus, while genes play an important role in autism spectrum disorder, it looks as if they are less important than previous studies have suggested.
一位太空生物学家在《科学》上说这可以“重新定义生命”，因为这是很重要的实验室证据，它表明有机体可以有比以前认为更灵活的化学组成。
This "redefines life" said the astrobiology researchers reporting in Science magazine, because it was laboratory evidence that organisms can be more chemically nimble than previously thought.
以前有研究表明，孕妇的体重和健康状况会影响到胎儿，但是该研究暗示父亲的健康状况和生活方式也有很重要。
Studies in the past found that a pregnant woman's body weight and state of health affect her fetus, but this study suggests the father's health and lifestyle may also be important.
这组数据表明，当被试们自荐回想起以前的记忆时，内侧颞叶结构(海马和杏仁核)的活动也逐渐减少。
This data set showed that medial temporal lobe structures (the hippocampus and amygdala) exhibited gradually decreasing activity as the participants recalled progressively older memories.
麦凯乐博士的这项发现表明，这种复杂在很久很久以前就开始了。
Dr McKellar's finds suggest, at least, that that complexity began to evolve a long time ago.
可以追溯到月球形成时的一块岩石表明这颗地球卫星比以前计算所确定的年轻了约2亿年，它的历史可能需要重写。
A rock thought to date from the moon's formation points to the satellite being about 200 million years younger than previously calculated, suggesting its history may need to be rewritten.
然后，对你的文献回顾做出清晰的参考书目，你必须表明你的问题(a)以前没有被回答过，(b)它的知道回答的。
Then, by making direct reference to your literature review, you must demonstrate that your question (a) has not been previously answered, and (b) is worth answering.
表明人类仍在进化的研究以前曾有开展，但是将个人的生育成功与生理变化直接作比较分析，这被认为还是第一次。
Research suggesting humans are evolving has been carried out before, but this is believed to be the first that directly compares reproductive success of individuals with physiological changes.
事实上，以前的研究也表明已婚的人趋向于与配偶有不同的基因。
In fact, previous studies have shown that married people tend to have different types of genes than their spouse.
虽然德勤签署了东南融通和中国高速频道以前年度的报告，但是目前仍没有证据表明德勤有任何过失。
There is no evidence yet that DTT is at fault, even though it signed off on previous accounts for both LFT and CCME.
以前的研究已经表明，哺乳期妇女的血糖和脂肪浓度在产后几周内得到改善。
Previous research had shown that lactating women have improved blood levels of glucose and fats within several weeks after giving birth.
以前的研究也表明，“穴居人”的日常饮食可以预防糖尿病。
Previous studies have suggested that the “caveman” diet could offer protection against diabetes.
他们早就知道以前就有相关的研究表明爱可以减少生理疼痛，但是他们想挖掘得更深，他们想了解在大脑里会发生什么事情。
They knew that a few earlier studies had suggested that love relieved pain, but they wanted to go further and find out just what was happening in the brain.
以前的研究表明，阿司匹林可以预防肠癌，但对于其他癌症，如乳腺癌和前列腺癌，它的效果则不太明显。
Previous research has suggested that aspirin can protect against bowel cancer, although results for other cancers, such as breast and prostate, were less clear-cut.
以前的研究已经表明太极在治疗关节炎方面可能有帮助。但是治疗效果如何，人们并不得知。
Previous studies have suggested that it could be helpful in the treatment of arthritis, but the results were unclear.
以前的研究已经表明太极在治疗关节炎方面可能有帮助。但是治疗效果如何，人们并不得知。
Previous studies have suggested that it could be helpful in the treatment of arthritis, but the results were unclear.
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