I told Norman I would invest in his venture as long as he agreed to one proviso.

我告诉诺曼，只要他同意一个限制性条款我就投资他的企业。

He agreed to their visit with the proviso that they should stay no longer than one week.

他同意他们来做客，但条件是逗留不得超过一周。

One proviso attaches to the legacy.

这个遗赠附带一项限制性条款。

A proviso attaches to the contract.

这个合同附带一项限制性条款。

One proviso is attached to this legacy.

这个遗赠附带一项限制性条款。