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.

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