They are firm but flexible.

他们坚持己见且灵活变通。

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Set firm timelines, but leave features flexible.

制定严格的时间安排，但是保持灵活的特性。

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Keep plans flexible until January when you can firm things up.

保持灵活的计划，至明年一月时，你可以坚定的东西。

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Keep plans flexible until January when you can firm things up.

保持灵活的计划，至明年一月时，你可以坚定的东西。

youdao