He made a firm decision to leave Fort Multry by boat.

他作出了明确的决定，要乘船离开穆尔特里堡。

《柯林斯英汉双解大词典》

We finally came to a firm decision on the matter.

我们最终对这件事作出了坚定的决定。

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I also make a firm decision to do my best to learn English.

我也报了很大的决心，要尽最大的努力学好英文。

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public relations and business development firm last year. He says finding a job out of college was tough and contributed to his decision to start his own business.

VOA: standard.2010.01.31

Cheltenham Borough Council approved the plan in principle last year but a firm decision has still not been made.

BBC: Cheltenham rickshaw business halted due to licence delay

So, a firm decision probably means offending someone and losing some votes.

BBC: Obama remains evasive on gay marriage

K.K. had given this house to his wife when, finally and uncharacteristically, he made a firm decision and told her she had to leave.

NEWYORKER: In Other Rooms, Other Wonders