[C,U] the use of money to get a profit or to make a business activity successful, or the money that is used

投资（的款项）

Foreign investment in Thailand rose by 79% last year.

去年在泰国的外国投资上升了 79%。

A Certificate of Deposit remains one of the safest investments.

定期存款单仍是最安全的投资之一。

We plan to buy some property as an investment.

我们打算买些房地产作为投资。

That year, Japanese investment in American real estate totaled $13.06 billion.

那年，日本投资美国房地产的总额达到了13.6 亿美元。

Each of us was required to put up a minimum investment of $5000.

我们每个人都要至少投资 5000 美元。

The Postal Service has made a large investment in new technology.

邮政管理局已在新科技上投入大笔资金。

Shareholders want to see a better return on their investment .

股东想看到他们的投资得到更好的收益。

tax cuts aimed at stimulating investment and expanding the economy

旨在刺激投资、发展经济的税收减免

[C] something that you buy or do because it will be useful later

投资（的对象）:

The lessons cost me over $500, but I consider them a good investment.

这些课程花了我五百多美元，但我认为这是一笔很好的投资。

[sing.,U] when you spend a large amount of time, energy, emotion etc on something

〔大量时间、精力、情感等的〕投入:

a huge investment of time and effort

时间和精力的大量投入