These gates are made from pure steel, and the inside part is filled with the concrete. The weight of the gates is 20 tons.
这些门用纯钢制作,里面用混凝土填充。这两扇门重达20吨。
It will be made of ultra-light weight carbonic materials, filled with helium, powered by solar energy, and moved via remote control.
这多云由超轻的材料做成,内部充满了氦气,由太阳能驱动,通过遥控来操作。
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