one side widening

• 单侧加宽

one side widening的用法和样例：

例句

1. In the case of homogeneous broadening only one mode can normally oscillate.
   对于均匀加宽的情况，只有一个模能正常地振荡。
2. As the gradient slackens, the Ganges and her tributaries begin to wander across an ever widening valley.
   随着河床坡度减缓，恒河及其支流开始缓缓流过一个加宽的河谷。