这个商业计划提出了一个有趣的投资提案。

The business plan puts forward an interesting investment ___proposition.

公司提出了一个合作方案，希望能共同开发新产品。

The company presented a business ___proposition to jointly develop new products.

说服他改变主意真是个棘手的难题。

Convincing him to change his mind is a tough ___proposition.

这个数学问题的解决依赖于数论中的一个关键命题。

The solution to this math problem relies on a key ___proposition in number theory.