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不牢固的
gen. nonsolidified; unsolidified
archit. loose
expl. weak
hydroel.st. unsecured
不牢〔稳〕固的
gen. be built on the sand
不牢固〔可靠〕的
gen. rackety
不牢固 〔安全〕的
archit. unsecured
不牢固的: 3 phrases in 3 subjects
Architecture1
Mechanic engineering1
Technology1