回落的英文：
run back

参考例句：

The gradual subsidence of the river
河水的逐渐回落.

Gold prices moved down.
金价回落了。

To fall away or back;decline or recede.
回落跌落;衰退或消减

It predicts that food prices are unlikely to fall back down for another two years.
据预测，今后2年里，粮食价格不太可能回落。

"The dollar rose in the morning, but fell again in the late afternoon. "
美元汇率上午呈上升趋势,但下午晚些时候又重新回落。

It has fallen back since the end of Januray by 2.3 per cent to Y108.25 on Monday.
自1月底以来，日元兑美元回落了2.3%，周一至108.25日元。

run是什么意思：
n. 奔跑，跑步；旅行；趋势
v. 跑步，奔跑；逃跑；参赛；行驶；运转；（使）流动；管理

run the rapids.
冲过急流

Run (or Hold) with the hare and hunt (or run) with the hounds
两面讨好

Hold (or Run) with the hare and run (or hunt) with the hounds
两面讨好

He runs as quick as a deer.
他跑得跟鹿一样快。

He runs as fast as Paul.
他跑得和保罗一样快。

back是什么意思：
n. 后面，背面，反面；背，背部；靠背；后卫
v. 支持；后退，倒退；背书；下赌注于
adj. 背部的；后面的；过去的；拖欠的.
adv. 以前；向后地；来回地；上溯

Stand back to back!
背靠背站好！

They are on the back of the menu.
它们在菜单背面。

Our seats on the train were back to back.
我们在火车上的坐位是背靠背的。

It happened far back in the past.
这事发生在久远的过去。

the back of a Chinese robe or jacket
后襟