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aluminium
mastery/ˌæl.(j)ʊˈmɪn.i.əm/noun
card 1 of 10 · fill in the blank
The boat hull was made out of _____ to keep it lightweight and rust-free.
card 1 of 10 · fill in the blank
The boat hull was made out of _____ to keep it lightweight and rust-free.