... flats 扁平状；平顶 flatten out拉平 flattened distribution 拉平分布 ...
2
?变平
... background flatten背景淡化 flatten out变平 S Flatten球状压平 ...
3
?下降或升高后变平
...up，climb， take off， jump，shoot up暴涨，soar，rocket， skyrocket 2、表示上升后保持平稳：flatten out(下降或升高后变平)， level off 举例：人口上升后保持平稳：the number of population mounted and leveled off.
If you leave, for example, a bar of ice supported only at one end, the end, the unsupported end will deform under its own weight, it'll kind of flattenout at one end, get distorted, deformed.