Important, 重要的. 有很多高级表达可以代替important,举例如下:

Significant,有意义的，重要的

Their change of plan is strange, but I don't think it's significant.

很奇怪他们改变的计划，但我觉得没什么用处。

Substantial 大量的, 实质上的，重要的

I care more about the spiritual life than the substantial life.

Influential 有权势的，有影响的

Our newspaper is an influential newspaper in the city.

Valuable 贵重的, 有价值的

Thank you for your valuable service.

Essential 必要的，重要的

Her most essential quality is kindness.

Vital 至关重要的，生死攸关的

The government saw the introduction of new technology as vital.

Crucial 至关重要的，决定性的

It's crucial that we maintain a healthy lifestyle to live a long life.

除形容词以外，我们也可以用相关的英语短语来表达"重要的"这个概念, 举例如下:

Attach importance to 重视,认为重要

Be of great importance

Attach great importance to 非常重视