The central portion of the bridge collapsed.

桥的中段坍塌了。

《牛津词典》

The more formal name for the central portion of this feature is IRAS 22298+6505.

照片中心位置更为正式的名称是IRAS 22298+6505。

youdao

In this residence the central portion includes a double gallery with arcades opening onto the ground floor.

在它的建筑中部有一个双层画廊，其拱廊从第一层往上延伸开来。

youdao

The tripartite lower grille comprises a blacked-out central portion flanked by large air intakes with upper and lower aero-blades, for extra awesomeness, I suppose.

WSJ: 2013 BMW M6 Coupe Review: A Hurtling Flume Ride on Dry Land | Rumble Seat by Dan Neil

In the 21st century global economy, the fact that Latinos will form a larger growing portion of the American workforce makes this challenge even more central to the nation: as more Americans retire, this will be the population that retirees and the rest of America depends upon.

WHITEHOUSE: Our Top Stories

We've almost become an exit-ramp economy, with a large portion of the jobs growing further and further away from the central cores.

NPR: Commuting 'Because They Have To'