a twofold increase in demand的用法和样例：
- Multiband transmission permits a reduction in error probability in exchange for at least a twofold increase in bandwidth and carrier power.
- A.There is a threefold increase in perinatal mortality, a twofold increase in abruptio placentae, and an increased rate of impaired fetal growth in pregnant women with preexisting hypertension.
- This increase in demand is likely to boost prices.
- In prospect of increase in demand, we should operate at full capacity.