The method is more efficient than others because it adds two carbon atoms at a time, rather than one, to the hydrocarbon molecules being formed.
这种方法比其他的更有效，因为它向构造中的碳氢化合物一次引入两个碳原子而不是一个。
Obviously, if each unit of work were two, or ten, or one hundred times as large as a single string method call, then the proportion of time spent in thread overhead would be correspondingly small.
显然，如果每个工作单元都相当于单个字符串方法调用的两倍、十倍或一百倍，那么所花费的线程开销比例就相应地更小了。
However, this method has two shortcomings: (1) it ignores the time value of money and (2) it ignores the performance of the investments beyond the payback period.
然而，这一方法有两个缺点：(1)它忽略了货币时间价值(2)它忽略了项目回收期以后的经营业绩。
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