Trade was the mainstay of the urban economy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges.

因为商队只能通过水路和山脉进入沙漠，贸易就成为了中东城市的主要经济支柱。

youdao

Sometimes I get thrown off the train in the middle of nowhere; sometimes I get to the Big Rock Candy Mountain.

有时候，在开往虚空的列车上，我中途摔了下来；有时候，我到了甜甜大山脉（指迪斯尼儿歌——译者注）。

youdao

One of the longest mountain ranges of the world rises the floor of the Atlantic. This mountain range runs north and south down the middle of the ocean.

世界上最长的山脉之一从大西洋海底隆起，这条山脉沿海底中部向南北延伸，几座山峰露出海面，形成岛屿。

youdao

Machu Picchu stands 2, 430 m above sea-level, in the middle of a tropical mountain forest, in an extraordinarily beautiful setting.

UNESCO: MEDIA SERVICES

Placing a seemingly incongruous space-age pod on a mountain top in the middle of the Alps is something Lovegrove has no qualms about doing.

CNN: Ross Lovegrove: Building an alpine dream

To experience the best leg of Via's cross-country service, take the Snow Train, which runs from Vancouver's grand beaux arts railroad station through a series of stunning snowbound mountain ranges to the hamlet of Jasper in the middle of 4, 200-square-mile Jasper National Park (home to some of the world's best, least-crowded skiing, at Marmot Basin).

FORBES: Through the Rockies In Style