Economic activity: 经济活动
level out: to stop rising or falling and become steady (经过涨落之后)保持平稳发展
注:也可以说是level off,意思相同.
Sales have levelled off after a period of rapid growth.
销售经过一段时间的快速增长后呈稳定状态.
recover: to return to a normal condition after a period of trouble or difficulty 复原,恢复常态
the economy is at last beginning to recover.
经济终于开始复苏了.