flatten out

动词 flatten out:

1. become flat or flatter
   同义词：flatten

1. Gold prices on the London market are expected to flatten out after a period of fluctuation.
   经过一段时期的波动后，预料伦敦市场的黄金价格将稳定下来。
2. The hills flatten out here.
   山到了这里变得平坦了。