to the extent necessary，译为在必要的范围内，类似的短语to the extent that/ to the same extent

1例句一

Except as otherwise specified in this Agreement, the payment of the Purchase Price shall be without any set-off or counterclaim of any nature or any restriction or condition and shall be made free and clear of any tax or other deductions of any nature unless Purchaser is required to make any tax deductions, in which case the sum payable by Purchaser shall be increased to the extent necessary to ensure that Seller receives a sum equal to the sum it would have received if no such deductions had been required.

除本协议另有规定之外，购买价格的支付不带有任何性质的抵销或反申索，也没有任何限制或条件，且没有任何税收或其他任何性质的扣减，除非买方被要求作出任何税额减扣，在这种情况下，买方应付的金额应当作出必要的增加，以确保卖方收到相当于上述扣除未要求作出时应当收到的金额。

2例句二

EachParty shall use confidential Information only to the extent necessary to fulfill its obligations under this contract.  

一方应仅在为履行本合同所必须的范围内而使用保密信息。