This bridge is twice as long as that one.
这句话是应翻译成“这座桥是那座桥的2倍长”还是“这座桥比那座桥长2倍”
“这座桥是那座桥的2倍长”和“这座桥比那座桥长2倍”当然有区别了阿
这座桥是那座桥的2倍长：这座桥=那座桥*2倍
这座桥比那座桥长2倍：这座桥=那座桥*（2+1）倍