The only road access is a tortuous mountain route.

惟一的通路是一条弯弯曲曲的山路。

《柯林斯英汉双解大词典》

In the intergranular spaces of rocks, however, fluid must flow around and between grains in a tortuous path; this winding path causes a resistance to flow.

然而，在粒间孔发育的岩石中，流体必须在颗粒周围的曲折通道中流动；而这种曲折通道会对其流动产生阻力。

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The second has involved a tortuous row over imported second-hand cars.

第二次是关于二手汽车的进口问题，双方有过曲折的争吵。

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That includes a tortuous calculation of a 2% excise tax on net investment income.

FORBES: Keeping Up With The Gateses

When I was in the music industry one of the most interesting things I observed was the tortuous experience a successful debut artist goes through when conceiving and producing their always highly anticipated follow-up album.

FORBES: President Obama Has The Tone Of A Challenger, Calls The WWE

Our correspondent says the election had been a tortuous process, and that Mr Pena Nieto is unlikely to see a quiet acceptance of the result.

BBC: Protesters outside electoral commission - 6 July