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свободное пространство stresses
gen.	空隙; 空闲的地方; 未被占用的空间
comp.	空地; 空地儿; 可用空间; 畅通空间; 隙地; 预留空间; 空场子; 空场
tech.	自由空间; 空区; 间隙; 空间; 孔隙

свободное пространство: 21 phrases in 7 subjects

General	3
Law	1
Metrology	1
Pharmacology	1
Radio	1
Technology	13
Telecommunications	1