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to phrases
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
Agriculture
2
Business
2
China
2
Compressors
1
Economy
2
Finances
2
Hydroelectric power stations
1
International trade
1
Technology
2
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