The extensive formwork used during casting often has undesirable effects on the environment or the ecology . 在浇筑混凝土时所用的大批模板往往对环境或生态平衡有着不良的影响。
Construction of the formwork and preparation of the metal reinforcement for shells required particular care and accuracy because of their limited thickness . 由于壳体的厚度有限,壳体的金属能加工制备与模板建造需要特别细心与精确。