angel investor
noun/ˌeɪndʒl ɪnˈvestə(r)/
/ˌeɪndʒl ɪnˈvestər/
(also angel, business angel)
- a person who supports a business by investing money in it, especially somebody who supports a new small business with their own money
天使投资者：通过投资来支持企业的人，特别是那些用自己的钱来支持新的小型企业的人