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| Railway bridge ： ウィキペディア英語版 |
Bridge
A bridge is a structure built to span physical obstacles without closing the way underneath such as a body of water, valley, or road, for the purpose of providing passage over the obstacle. There are many different designs that all serve unique purposes and apply to different situations. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it.
==Etymology==
The ''Oxford English Dictionary'' traces the origin of the word ''bridge'' to an Old English word ''brycg'', of the same meaning, derived from the hypothetical Proto-Germanic root ''brugjō''. There are cognates in other Germanic languages.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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