Your wedding ring can be engraved with a personal inscription at no extra cost.

你的结婚戒指可以刻上个人题字不另收费。

《柯林斯英汉双解大词典》

Guests at this hotel can use the gym at no extra cost.

这家饭店的客人们可以使用健身房，不再额外收费。

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Guests sat this hotel can use the gym at no extra cost.

这家饭店的客人们可以使用健身房，不再额外收费。

youdao

The service is available to paying Gold members of Xbox Live for no extra cost.

FORBES: Connect

This is at no extra cost and there are no changes to their existing price plans.

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And also, insurance companies will be required to cover, at no extra cost, routine checkups and preventive care.

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