形容词
中文翻译：不变的
同义词：
['immutable', 'unalterable', 'invariable']
例句：
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1. The weather is unchangeable, and we need to prepare for it accordingly.
天气是不变的，我们需要为此做好准备。
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2. The decision was unchangeable, and I had no choice but to follow it.
决定是不可更改的，我只能跟随它。
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3. The company's policy is unchangeable, and we must adhere to it strictly.
公司的政策是不可更改的，我们必须严格遵守。