研究表明几乎一半人类肿瘤都存在抑癌基因的失活，可见抑癌基因失活与肿瘤生长有着密切的关系。
Studies have sh own that the anti oncogene inactivation was closely related to tumor development because of the findings of anti oncogene inactivation in nearly one half of human tumors.
我们永远也不会知道这种计算能力是何时、如何发展起来的，但可以肯定的是，在人类形成半永久定居点的时候，这种计数法已经发展得很好了。
It will never be known how and when this numeration ability developed, but it is certain that numeration was well developed by the time humans had formed even semi-permanent settlements.
研究人员随后给狗狗展示与训练中完全不同的人的另一半脸，来测试它们区分人类面部表情的能力。
The researchers then tested the dogs' ability to distinguish between human facial expressions by showing them the other half of the person's face on images totally different from the ones used in training.
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