adding dowel bar

• 增设传力杆

adding dowel bar的用法和样例：

例句

1. In order to improve the load transfer ability of the highway with heavy traffic, a dowel bar can be installed in the contraction joint of the rigid pavement.
   摘要对于交通量日益增大的高速公路，可以通过增设传力杆来提高路面缩缝的传荷能力，有效地减少错台和断板现象。