投资额的英文：
amount of investment
amount invested

参考例句：

Investment is turning up sharply.
投资额急遽增长.

His investments amount to five million dollars.
他的投资额达五百万元。

We should how much investment is going on in that area.
那得了解那个地区有多少投资额。

The asset turnover ratio was improved by increasing sales by $2 and by reducing investment by $3.
资产周转率的提高是由于增加了2元的销售额和减少3元的投资额的结果。

amount是什么意思：
v. 总计，共达；等于，相当于
n. 金额；数量，数额

amount deposited
存款金额

A small amount of liquid;a drop.
少量液体；一滴

My savings amount to $2001.
我的储蓄共达2000 美元。

investment是什么意思：
n. 投资（额）；投入；可投资的东西

invest material
覆盖材料

profits and losses on disposal of investments
转让投资的损益

He bought it purely as an investment.
他纯粹是作为投资而购买的。

invested是什么意思：
v. 投资，耗费；授予；穿衣，装饰；覆盖，包围

invest material
覆盖材料

profits and losses on disposal of investments
转让投资的损益

He bought it purely as an investment.
他纯粹是作为投资而购买的。