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宣布某物无效

To make an official statement that something is legally void.

正式声明某物在法律上是无效的。

使某物无效

To cause something, like a contract, to become legally invalid.

导致某物（如合同）在法律上变得无效。

（法律上）无效

Used to describe a state of being legally void or invalid.

用于描述在法律上无效或作废的状态。

认定某物无效

To consider or judge something to be legally void, in a formal context.

在正式场合下，认为或判定某物在法律上无效。

变得（法律上）无效

Used to describe the process of becoming legally void or invalid.

用于描述变为法律上无效或作废的过程。