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Planning to switch fields? Be bold, know your limits and choose your institution wisely, say three UK research leaders.
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"Space regulations don't cover the new problems emerging - interference with astronomical observations, risk of collision in orbit, risk of stuff falling on our heads, and now it is becoming clear, atmospheric pollution," says Andy Lawrence, Professor of Astronomy at the University of Edinburgh.
swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾