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mur de protection
gen.	security fence; security wall; separation fence
construct.	external wall; protection wall
environ.	noise wall
mater.sc., construct.	bund wall; compound wall; fire wall; tank dike; bund
nucl.phys.	protecting wall; protective wall; radiation protecting wall; radiation protective wall; structural protective barrier; shield wall; shielding wall

mur de protection: 8 phrases in 4 subjects

Construction	4
General	2
Nuclear physics	1
Soil science	1