The extensive formwork used during casting often has undesirable effects on the environment or the ecology . 在澆筑混凝土?xí)r所用的大批模板往往對環(huán)境或生態(tài)平衡有著不良的影響。
Construction of the formwork and preparation of the metal reinforcement for shells required particular care and accuracy because of their limited thickness . 由于殼體的厚度有限,殼體的金屬能加工制備與模板建造需要特別細(xì)心與精確。