您要查找的是不是：
- 倒U曲线 inverse U curve
- “倒U曲线”假说 "upside- down U curve" hypothesis
- 库兹涅茨倒U曲线 Kuznets' reversed U curve
- 曲线 (n) curved shape
- 倒U假说 Inverted-U-Type Hypothesis
- u盘
- 倒U型特征 converse U type characteristic
- 曲线的 curvilinear
- 倒出 swill
- 标准曲线 specification curve
- 倒U型假说 Inverted-U Hypothesis
- 曲线拟合 curve fitting
- 倒掉 outwell
- 倒档 reverse gear
- 拟合曲线 fitting curve
- 倒钩 barb
- 特性曲线 frequency plot
- 翻倒 overturn
- 变化曲线 change curve
- 倒过来 the other way around
