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to phrases
sound materials
libr. 有声资料
sound material
tech. 良好材料
sound materials
: 47 phrases in 16 subjects
Automobiles2
Aviation4
Earth sciences1
Electronics1
Environment1
Hydroelectric power stations1
Metallurgy1
Nautical1
Oil / petroleum1
Plastics3
Project management1
Rail transport1
Refrigeration1
Space6
Technology21
Textile industry1

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