大质量恒星在超新星爆发中结束了自己的生命并将重元素喷洒进太空中，它们将在那里重新结合成下一代的恒星及其周围的行星。
Massive stars end their lives with supernova explosions that spray the heavy elements into space, where they are incorporated into the next generation of stars and help seed the formation of planets.
实验结束时，完全躺在床上的小组的新合成肌肉减少近50%，而离心组始终以正常速度合成着肌肉。
By the end of the study, synthesis of new muscle in the total bed-rest group had dropped by almost 50 percent, while the centrifuge group kept making muscle at a normal rate.
而现代合成杀虫剂的发明在一定程度上结束了尼古丁的使命。
The invention of modern, synthetic insecticides has more or less killed that practice off.
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