There is no doubt that by incorporating(把……融入arches into the design of arch bridges, they have gained some definite advantages. However, no matter how fantastic their design is, there are still some drawbacks that cannot be avoided. So we can conclude that the decision of having an arch bridge can be made by considering the aforementioned pros and cons.

　　Arch bridges

　　General

　　introduction

　　●Arch bridges have been in

　　1

　　for thousands of years.

　　●Their common building materials used to be bricks and stones, and now many new materials like concrete and steel have been used, because of which the arches are built more

　　2

　　.

　　Pros

　　●Arch bridges are strong thanks to their curved designs, which

　　3

　　the load force being pushed straight downwards.

　　●The designs also contribute to the equal

　　4

　　of the bending force, and thus the bridges are more

　　5

　　to the force.

　　●Diverse materials used to build arch bridges are

　　6

　　.

　　●The application of these materials enables the bridges to undertake heavy pressure, thus making them

　　7

　　.

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