在腰部弯曲：指身体前屈，腰部向前弯曲的动作。
... double in 向内折叠 double over 折起,(使)弯下身子 double sb over (使)某人弯下身 ...
Demand for food is expected to double over the next forty years.
粮食需求预计在接下来的四十年翻一番。
He expects consumption of coal to double over the following 10 years.
他预计在未来十年，煤的消耗量将翻番。
Globally, the number of patients on dialysis is likely to double over the coming decade.
纵观全球，透析治疗的患者人数几乎是近十年的两倍。
"They would have very, very severe stomach cramps, and double over, and throw up or have diarrhea."
VOA : standard.2010.01.02
which it also plans to export. Ford has said small cars represent the future for automakers, and expects sales of these cars to double over the next decade.
VOA : standard.2009.09.25
And he set a goal to double American exports over the next five years.
VOA : special.2010.01.30
Moreover, these results assume federal revenues more than double over the next 10 years.
FORBES: President Obama's Predictable Budget: More Spending, More Tax Increases
And they're going to more than double over the next decade if we don't do anything.
Airbus and Boeing, the world's leading big-jet manufacturers, both expect freighter fleets to double over that period.