很多研究者认为这一能力对于在过去从事狩猎的男人来说很重要，他们必须具备通过地标寻找路径的能力。
Many researchers suggest such skills may have been important in the past for man-the-hunter, who needed to be able to find his way round the landscape.
在过去的5年中，他们通过用太空望远镜和地面望远镜研究了这些星系的光波、进红外线波和X光波。
Over the past 5 years, they have studied those galaxies in optical, near-infrared, and X-ray wavelengths using orbiting and ground-based telescopes.
为了准确预测未来气候变化的结果，科学家正在研究过去海平面的变化，他们准备通过观察地核来进行这项研究。
Scientists are studying past changes in sea level in order to make accurate future predictions of the consequence of climate change, and they are looking down to Earth's core to do so.
研究人员发现，他们可以通过去除发送“来这吧”信号的分子开关，抑制破坏性免疫细胞进入神经系统。
The researchers found that they could prevent destructive immune cells from entering nervous system tissue by eliminating a molecular switch that sends "come here" messages to immune cells.
他们指出，地球曾在过去发生磁极翻转，这是谁都无法否认的事实。通过研究太阳黑子或者磁场，我们可以对磁极翻转进行计算。
They point to evidence of pole shifts in Earth's past and claim that these reversals can be calculated by studying sunspots or magnetic field theory.
研究人员经过实验发现，通过去除哺乳动物细胞中的PSF或sin3 -组蛋白去乙酰化酶复合物，他们能够缩短生物钟周期的长度。
The researchers found that they could shorten the length of the circadian cycle by removing PSF or SIN3-histone deacetylase complex from mammalian cells.
研究人员经过实验发现，通过去除哺乳动物细胞中的PSF或sin3 -组蛋白去乙酰化酶复合物，他们能够缩短生物钟周期的长度。
The researchers found that they could shorten the length of the circadian cycle by removing PSF or SIN3-histone deacetylase complex from mammalian cells.
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