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Aluminum is naturally strong and lightweight. It's the ideal material for Apple Watch Sport.
铝坚固而轻盈，堪称Apple Watch Sport的理想原材料。
Our engineers have custom designed a new alloy.
我们的工程师研发出了一种全新的合金。
It is 60% stronger than standard alloys, but just as light.
它的强度超过普通铝合金60%，却轻盈依旧。
This requires precision alloying.
这需要极为精密的合金铸造技术。
Raw aluminum of exceptional purity is first heated to a molten state. Tightly controlled amounts of magnesium and zinc are then added.
首先，要将高纯度的铝材加热到熔融状态，并在添加镁和锌时，严格控制其比例。
As these elements bind together, they form a protective compound that strengthens the metal.
当这些元素熔炼在一起时，会形成稳定的复合物，使其合金轻度大幅提高。
The alloy is then poured, jet-cooled and cast.
合金经过浇铸，冷却，然后成形。
A high temperature treatment minimizes uneven chemistry in the billets and ensures proper grain structure.
再通过高温处理，将铸坯中不均匀的部分减至最少，并确保适当的纹理结构。
Next, a finely tuned extrusion process creates a uniform surface free of defects.
接下来，精细调校的挤压工序会为合金带来平滑到几近无瑕的表面。
After being meticulously formed, each case is machined, buffed, and then textured with microscopic zirconia beads to achieve a consistent, satin finish.
进一步精确塑形后，每一个表壳都经过加工，抛光，添加氧化锆微粒质感，来营造通体一致的磨光表面。
Finally, anodizing creates a hard, clear outer layer that helps protect against dings and scratches.
最后的阳极氧化工艺，会形成一个坚硬而清透的保护层，来防止磕碰和刮擦。
We believe this aluminum alloy sets a new standard. Both in the way it performs, and the way it looks.
我们相信，无论是性能，还是外观，这款铝金属都将开创一个业界的新标准。
