The threat of the Zika virus reaching the us has come a step closer.
寨卡病毒被传入美国的威胁进一步升级。
Now researchers have come a step closer by finding Earth's gassy twin in another solar system 200 light years away.
不过，研究者们最近离这一目标又近了一步，在距离地球200光年的外星系中发现了地球的“双胞胎”。
French scientists believe they have come a step closer to understanding how the Vikings were able to navigate across the sea well before the invention of the magnetic compass.
法国科学家认为进一步了解为何维京人能在指南针发明之前航行大海之谜。
French scientists believe they have come a step closer to understanding how the Vikings were able to navigate across the sea well before the invention of the magnetic compass.
法国科学家认为进一步了解为何维京人能在指南针发明之前航行大海之谜。
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