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echo cancellation
agric.	回音消除
avia.	回声消除
el.	回波相消; 回波消相
IT	回波消除
multimed.	回波取消
proj.manag.	取消响应
space	回声抵消
tech.	回波对消; 重影消除; 双回路对消
telecom.	回波抵消

echo cancellation: 9 phrases in 4 subjects

Aviation	1
Electronics	6
Geophysics	1
Telecommunications	1