n. 加倍；并线；折回；防护板；衬里
v. 使加倍；使成双（double 的 ing 形式）；绕过；握紧
adj. 双重的；折叠的
chromosome doubling染色体加倍；染色体复制；染色体配对
frequency doubling倍频
1.Meat output 'doubling'.
肉类产量的“加倍”。
2.The energy efficiency of computing is doubling every 18 months.
计算机的能源效率(晶体管数目)每18个月翻一番。
3.Algae can reproduce rapidly, doubling in as little as a few hours.
藻类可以快速繁殖，仅仅几个小时就能翻倍。
4.Sales integration: the secret to doubling your sales.
销售一体化：销售翻倍的秘诀。
5.We had made a dent in the problem by doubling the Earned Income Tax Credit.
我们已通过加倍劳务所得收入抵免来削弱这个问题的影响。
6.It is for this reason that I set a goal of doubling America's exports in the next five years.
正是这个原因，我制定了在今后五年将美国出口翻一番的目标。