Geologists have long known that the Earth's mantle is heterogeneous, but its spatial arrangement remains unresolved—is the mantle essentially layered or irregu larly heterogeneous?
地质学家早就知道地球的地幔是不均匀的，但是它的空间排列仍然没有确定——地幔本质上是分层的还是完全不均匀的？
Athletes and scientists have long known that meal timing affects performance.
运动员和科学家早就知道，用餐时间会影响成绩。
Nevertheless, researchers have discovered that a process long known to discolor and toughen foods may also contribute to age related impairment of both cells and tissues.
然而，研究人员发现，一个长期以来众所周知的使食物变色和变硬的过程也可能与年龄相关的细胞和组织损伤有关。
We have long known that if we want to build software that solves a problem, we need to define the problem.
我们很久以前已经知道，如果我们想要创建一个解决问题的软件，我们就需要定义问题。
Scientists have long known that bird songs vary in different settings and that urban songbirds in particular sing at a higher pitch.
科学家们早就知道，鸟类在不同的环境下的鸣叫是不同的，而市区的鸟是以更高的音调鸣叫。
Scientists have long known that the skin of frogs contains plenty of powerful germ-fighting substances because of the hostileenvironments they exist in.
科学家很久以前就知道，由于生存环境恶劣，青蛙的皮肤中含有大量能够对抗微生物的物质。
Psychologists have long known that different people can see and think about the same events in different ways, but they had done little research on how these interpretations affect well-being.
尽管心理学家早就知道，不同的人对于同样的事情可以有不同看法，可是这些看法对个人的幸福感到底有着怎样的影响，则没有什么研究。
Doctors have long known that amantadine treatment causes abnormal changes in the cornea in some Parkinson's patients.
医生们早就知道金刚烷胺在一些帕金森病人身上能够导致角膜功能异常。
Geneticists have long known that new traits often require new genes, but the question remains where new genes originate.
遗传学家早就知道新特性的形成一般需要新的基因，但问题是新的基因是哪来的？
Scientists have long known that deaf or blind people have heightened senses outside of their impairment.
科学家一直都知道失聪或失明的人提高了受损感官以外的感觉。
GEOLOGISTS have long known that some Marine earthquakes generate fierce tsunamis and some do not.
地质学家们早已知道有的海洋地震会引起强烈海啸，而有的则不会。
And researchers have long known that crows-like many other animals-can quickly learn to recognize people who feed them.
研究者早已经知道像乌鸦这样的很多其他动物能够迅速学会辨识给它们喂食的人类。
Chemists have long known that atoms in a molecule vibrate at a particular frequency, depending on their overall molecular structure.
化学家们早就知道，在分子中原子以特定的取决于整体分子结构的频率振动。
Scientists have long known that obesity is associated with a host of other health conditions, including Type 2 diabetes and heart disease.
科学家向来认为肥胖症是与一系列健康状况相关的，包括2型糖尿病和心脏病。
Rich Indians have long known that they command more powerful means to influence politicians than votes.
印度富人有比投票更有力的方式去影响政客，这也早已广为人知。
Researchers have long known that modern humans lack the genetic variation found in other living primates, such as chimpanzees or gorillas, even though our current population size is so much larger.
科学家以前就知道，虽然我们人口众多，但现代人不像其它现存的灵长类动物（比如黑猩猩和大猩猩）有那么多遗传变异。
We have long known that transportation is a service and vendor managed inventory is a service-as in nouns.
我们早已熟知运输是一项服务，供应商管理库存也是一项服务，在这里“服务”都是名词。
Geologists have long known that when peridotite is exposed to the air it can react quickly with carbon dioxide to form carbonates like limestone or marble.
地理学家们以前就发现橄榄岩暴露于空气中会很快与二氧化碳反应生成碳酸盐，和石灰岩或大理石的反应一样。
The old-boys’ club proves that men have long known that a professional network is imperative to success.
老男孩俱乐部证明，男子早就知道，专业的网络知识是取得成功的必备条件。
Scientists have long known that bacteria and viruses grow more rapidly and virulently in space.
科学家很久以来就知道在太空细菌和病毒的繁殖会更迅速毒力会更强。
Scientists have long known that vitamin D is a vital nutrient that the skin produces when hit by sunlight. The amount varies, depending on where the person lives, skin pigment, age and other factors.
科学界的共识是,人的皮肤可以通过日晒产生维生素D.而产生的数量并不固定,这取决于人所在地,皮肤的状况,年龄以及其他的因素.
Scientists have long known that some dinosaurs were egg snatchers, and recent fossil evidence suggests mammals also dined on young dinosaurs.
科学家早已知道恐龙是蛋掠夺者，新近的化石证据表明哺乳动物也吃年幼的恐龙。
Experts have long known that some kinds of people - including the mentally impaired, the mentally ill, the young and the easily led - are the likeliest to be induced to confess.
专家早就发现有一些人最容易被引导坦白罪行，其中包括有智力缺陷的人，精神病人，年轻人和容易被误导的人。
Scientists have long known that small, dense LDL particles sneak into the artery wall to build up and narrow blood vessels more easily than larger, fluffier particles.
长期以来科学家发现，密集的低密度脂小颗粒偷袭进入动脉壁，比蓬松的大颗粒更容易堵塞血管。
Doctors have long known that some antidepressants and other medicines can lower the amount of tamoxifen's active form in the bloodstream.
医生很早就知道，某些抗抑郁药物可以降低他莫昔芬在血液中的活性成分浓度。
Scientists have long known that a moderate intake of alcohol, and red wine in particular, is associated with a lowered risk of heart disease and other benefits.
科学家早就知道适量摄入酒精，特别是红酒，有助于降低心脏病的风险，还有其他好处。
Scientists have long known that a moderate intake of alcohol, and red wine in particular, is associated with a lowered risk of heart disease and other benefits.
科学家早就知道适量摄入酒精，特别是红酒，有助于降低心脏病的风险，还有其他好处。
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