The question is whether the arch needs support.
I thought "support" under an arch structure such as a bridge weakens it.
所有跟帖:
• 你的议论是值得考虑。如果足弓已经塌陷,不能让它总是塌着的,是否应该人为地支撑出一个弓来呢。。。 -御用文人- ♀ (0 bytes) () 11/08/2014 postreply 13:23:34