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control hierarchy [kɔn’treul 'haɪ(ə)ra:kɪ]
AI.	控制层级
met.	控制级别; 控制层次
tech.	控制分层; 多级控制; 递阶控制

control hierarchy: 6 phrases in 4 subjects

Hydroelectric power stations	1
Information technology	1
Technology	2
Telecommunications	2