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ballast [ballasts]▼(heavy material placed in the hold of a vessel)noun[UK: ˈbæ.ləst] [US: ˈbæ.ləst]
burden [burdens]▼(heavy load)noun[UK: ˈbɜːd.n̩] [US: ˈbɝː.dn̩]
seismic load▼(external force applied to a building structure)noun
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