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usefulness ['juːsflnəs] adj.
avia. 有效性
busin. 有效; 有益
el. 可用性
hydroel.st. 效益; 实用性
interntl.trade. 有用; 有用性
tech. 效用
usefulness: 15 phrases in 9 subjects
Agriculture2
Business2
China2
Compressors1
Economy2
Finances2
Hydroelectric power stations1
International trade1
Technology2

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