It is not fixed.

它不是固定的。

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The mastery oriented children, on the other hand, think intelligence is not fixed and can be developed through education and hard work.

另一方面，掌握型儿童认为智力不是固定的，可以通过教育和努力来发展。

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The mastery-oriented children, on the other hand, think intelligence is not fixed and can be developed through education and hard work.

另一方面，掌控型的孩子认为智力水平并不是固定不变的，人们可以通过接受教育和努力来提高自己的智力。

youdao

Adjustable rate mortgages have a long term -they might last for thirty years -but the interest rate is not fixed for the whole thirty years.

可调利率抵押贷款的期限很长,也许会长达30年,但是利率在30年间并不是固定的

耶鲁公开课 - 金融市场课程节选

Some will allow a top-up to variable-rate Isas, but not to fixed-rate products.

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Party lawmaker Sin Chung-kai asked Tung last week to explain why he had moved to open the television market, but not the fixed-line telephone sector, now limited to four operators, including one owned by tycoon Li.

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Teams who exceed the limit - which does not cover some expenses such as driver salaries, fines, and marketing - do not face any fixed penalties, but will have their fate decided by the FIA depending on the degree of their overspend.

BBC: F1 'can survive without Ferrari'