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Rebecca is still smarting from Evan Drake's departure to Japan. So instead of men, she focuses her energies on furthering her career - she figures that Evan Drake took all the key players from the company to Japan with him, and thus all those that knew she is a "washout" are now all gone - and buying a Mercedes. But realistically, her defenses are weakened, so when Sam asks her...。子弹经过两百年的科学研究，从一个简单的铅球，变成性能极佳的弹药。科学新发现将介绍子弹的科学，以及子弹如何凭科技的进步，演化为现在的弹药。。