There was nothing we could do other than wait.

除了等以外我们没有其他办法

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Other than 用在否定句后，引出某种情况下涉及的唯一的人或事，意思是除了……以外。

例：
There was a reluctance to talk about their reports to anyone other than colleagues.
除了同事之外，他们不愿意向任何人谈论他们的报告。