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》

The window looked down on the gravel road stretching south and it occurred to him that for his growing-up years that was the only road Jack knew.

窗外，一条碎石路向南延伸，他蓦然想起，杰克小时候就只认得这一条路。

youdao

El Espinazo Del diablo or ‘The devil’s backbone’ is the mountain pass in Durango, Mexico. It’s about 5 hours long, and it was the only road from Durango to Mazatlan Sinaloa for a long time.

El Espinazo Del diablo 或 称做“魔鬼的脊梁”是墨西哥Durango的一条山路。

youdao

Skyline Drive is the only road through Shenandoah.

VOA: special.2009.09.21

When I count, there are only you and I together But when I look ahead up the white road There is always another walking beside you.

VOA: special.2010.02.24

It is the only trail now open -- the White man's road."

VOA: special.2010.04.08

The Palestinians have long believed this is the only road map Mr Sharon is interested in.

ECONOMIST: A dead end?

And the only road to safety is the long road that is paved on reality.

CENTERFORSECURITYPOLICY: A road paved on reality

The only road that passes through the district is the key Karakoram Highway (KKH) that connects Pakistan with China.

BBC: In the shadow of Pakistan's Taliban war