She won't pay any extra.

她不会支付任何额外费用。

《柯林斯英汉双解大词典》

You don't have to pay extra for breakfast.

你不必付额外的早餐钱。

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For all the discomforts, the long hours, and no days off, there is an incentive - extra pay.

BBC: HMS Triumph: Life on board a Royal Navy submarine

Bluetooth may be cheaper, but it faces many of the same chicken-and-egg problems: why pay extra for a Bluetooth-enabled printer if you do not have a Bluetooth-enabled laptop, and vice versa?

ECONOMIST: REPORT: WIRELESS COMMUNICATIONS

If Europeans prefer time on the ski-slopes to extra pay, that seems fair enough.

ECONOMIST: Why is Europe growing so slowly?