"If you build a nuclear reactor or or any kind of base on the moon, you can then start claiming that you have a safety zone around it, because you have equipment there," says Dr Barber.
与此同时，研发投入在千万元及以上区间的企业数量，已经连续五年保持两位数的增长，反映出更多企业正在系统化、规模化地投入研发活动。
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Number (4): Everything in this space must add up to 4. The answer is 5-3, placed vertically; 1-1, placed horizontally.
America was mired in Vietnam abroad and civil unrest at home. But at that moment, it seemed that humanity was united.
Alison Francis,Senior Science Journalist