The density of the bubbles determines the strength of the products produced.
2
第二句，铝的密度低。
Second statement: Aluminum has low density.
3
然而，诸如铝和镁之类的一些金属则具有低密度，并被用于既需要金属特性又要求重量轻的场合。
However some metals such as aluminum or magnesium have low densities and are used in applications that require other metallic properties but also require low weight.
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