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.
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