陈琦 戈弋GRE长难句300例unit 4.doc

Unfortunately, the documentation of these and other epidemics is slight and frequently unreliable, and it is necessary to supplement what little we do know with evidence from recent epidemics among Native Americans. 不幸的是，对这些流行病和其他流行病的记录的数量很少而且经常不可靠，因而有必要把美国土著中最近发生的流行病的证据补充到我们知之甚少的信息中。 Scientists have begun to suspect that this intergalactic gas is probably a mixture of gases left over from the “big bong” when the galaxies were formed and gas was forced out of galaxies by supernova explosions. 科学家们开始推测，这种星际间的气体可能是一种从 “大爆炸”遗留下来的一些气体的混合物，当时形成了许多星系而且超新星的爆炸使得这些气体脱离了星系。 However，recent investigations have shown that the concentrations of the most mRNA’s correlate best, not with their synthesis rate, but rather with the equally variable rates at which cells degrade the different mRNA’s in their cytoplasm. 但是最近的调查已经表明，大多数mRNA的浓度并不是与其合成速率最相关，而是与细胞在其细胞质中降解不同的mRNA的速率最为相关，降解速率与合成速率一样是易变的。 In recent studies, however, we have discovered that the production and release in brain neurons of the neurotransmitter serotonin (neurotransmitters are compounds that neurons use to transmit signals to other cells) depend directly on the food that the body processes. 但是，在最近的研究中我们发现，在大脑神经元中的对神经传递物质血清素（神经传递物质是神经元用来把信号传递给其它细胞的化合物）的产生与释放直接取决于身体所加工的食物。 This revisionist view of Jim Crow legislation grew in part from the research that Woodward had done for the NAACP legal campaign during its preparation for the Brown v. Board of Education. 这种对黑人的立法做出修正的观点部分来源于Jim Crow为全国有色人种协进会（NAACP）的法律运动所做的研究，当时NAACP正在为布朗诉讼教育委员会案做准备。 These techniques have strongly suggested that although the true bacteria indeed form a large coherent group, certain other bacteria , the archaebacteria, which are also prokaryotes and which resemble true bacteria, represent a distinct evolutionary branch that far antedates the common ancestor of all true bacteria. 这些技术强烈的暗示，虽然真细菌确实形成了一个大型的、一致的种群，但是一些其他的细菌，也就是那些属于原核生物同时也很像真细菌的古细菌，代表着一个独立的进化分支，这个分支远远地早于所有真细菌的共同祖先。 The old belief that climatic stability accounts for the high level of spe