求翻译：造成这种现象的结果，主要是使混凝土结构大大降低了结构的严密性，其疏松的结构强度几乎降低到最低点，在使用过程中其承受能力极大地减少，并且容易遭受腐蚀而造成重大的损伤，严重地降低了工程的承载力和耐用性。造成这种现象的原因大体有以下几点：是什么意思？

Results of this phenomenon, mainly so that greatly reduce the tightness of structure of concrete structure, its loose structure strength was almost reduced to the lowest point, in the process of using its capacity significantly reduced, and is susceptible to corrosion and caused significant damage, severely reduces the bearing capacity and durability of the project. There are several reasons for this phenomenon in general points: