To create the dark metal finish on the two upper levels, these blocks are clad with Galvalume - a type of steel sheet that is coated with an aluminium and zinc alloy.
为了在上两层创建黑色的金属饰面，这些体块都包裹了铝锌合金镀层——这是一种镀有铝锌合金的钢板。
2
Back upper intake air, aluminium alloy frame, coatedsteel.