他的话是有一定根据的。

There is some substance in what he says.

《牛津词典》

假如你对专业的期望基于有一定根据的猜测，那么你将来很可能会改变主意。

If you're basing your expected major on an educated guess, there is a good chance you'll change your mind.

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例如，有工程师根据一定的能源价格对各种发电形式的成本计算，包括燃煤发电、燃气发电、核能与太阳能发电。

These will include, for instance, engineers’ best calculations of how much it costs to generate electricity in various ways, from coal, gas and nuclear and solar power at given resource prices.

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