1. The new building has aluminum siding and roofing.
    这座新楼的墙板和屋顶都是铝制的。

2. Yet, loaded with practice bombs and 8,000 pounds of fuel, the mostly aluminum aircraft weighs some 15 tons.
    可是，携带着演习炸弹和8,000磅汽油，这架主要用铝合金制造的飞机重达15吨左右。