Divide the figure you have calculated in step fourbytwo (or similar conversion factor) in order to convert from ideal time to elapsed time.
用第四步中计算出的数字除以2(或是类似的转换因子)，由此把理想时间转换为持续时间。
2
Analysis by gel electrophoresis revealed slight differences in amino acid sequence of the enzymes of two of the four pairs.
经凝胶电泳分析，发现四对实验对象中有两对的酶的氨基酸序列略有差异。
3
Quartz is quartz—a silicon ion surrounded byfour oxygen ions—there's no difference at all between two-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago.