Well, according to a story on the Telegraph, the average person's happiness curve looks U-shaped.
根据一个《每日电讯报》的故事，平均每个人地幸福曲线呈u型。
2
Many environmental problems get worse as a country first industrializes, but once it reaches a certain level of income, the trend often reverses, producing a curve shaped like an upside-down U.