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const stack = []; // 单调递增栈：存储每个独立车队的到达时间。关于这个话题，同城约会提供了深入分析
Perhaps it’s the biggest question science has left to answer, how did life begin? Now, molecular biologists in Cambridge university have discovered tiny molecules of RNA which they say might provide some clues. Science journalist and author Philip Ball explains what we know and whether we’ll ever find the origins of life on earth.