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1·The central portion of the bridge collapsed.

桥的中段坍塌了。《牛津词典》

2·A central portion of a city, between uptown and downtown.

市中心：城市行政机构所在地区，一般邻近商业区。

3·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。

4·The large central portion of the pack can contain up to 8 cubic feet or 80 pounds of material.

背包中央可以容纳的体积至多8立方英尺，重量至多80磅。

5·Membrane electrode assembly (MEA) is the central portion of proton exchange membrane fuel cell (PEMFC).

膜电极(MEA)是质子交换膜燃料电池(pemfc)的核心技术。

6·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。

7·Before he had reached the central portion of the city he thought the whole matter over and decided it would be useless.

在到达市中心之前，他把整件事情想了一遍，认定去了也没用。

8·It's important to note that digital zoom works by cropping out the central portion of the image that you are taking and blowing it up3digitally.

重要的是要注意：数字变焦的运作是通过剪裁出你正在拍摄的影像的中间部位，并进行数字放大。

9·It shows that the dimension of gage (the central portion with equal section) is critical for the stress distribution in the dog-bone-shaped specimen.

结果表明：狗骨形试样中，中间等截面段尺寸对试样中应力的大小、分布影响很大。

10·The hinge has laterally spaced end portions (52, 54) on opposite sides of the central portion and having concave outer surfaces when the lid is closed.

所述铰链具有在所述中心部分的相反侧上横向间隔开的端部分(52,54)，并且所述端部分在所述盖闭合时具有凹形外表面。