Build (one’s) hopes on someone or something:
To have expectations that are tied to the success, performance, etc., of a particular person or thing.
表达 “build one’s hopes on someone or something” 的意思是 “把希望寄托于某人或某事的成功或表现，希望此人或此事能达到预期的目标”。
例句
The company built their hopes on an advertising campaign. If it doesn’t work, the company might have to close.
公司把希望寄托于广告宣传上。如果不奏效，那么公司可能不得不关闭。
Don’t build your hopes on one project. If we start three or more projects, there will be more chance of success.
不要寄望于一个项目的成功。如果我们开展三个或更多的项目，成功的可能性会更高。
I built my hopes on him delivering the presentation to the investors and getting us the deal. He managed to do it!
我寄希望于他能向投资者作演示报告，帮我们谈定这笔生意上。他成功办到了！
