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pitch period
 pitch period
IT 基音周期
| estimation
 estimation
econ. 预算
math. 估计
met. 估算; 估定; 测定; 预测; 评估

to phrases
pitch period
IT 基音周期
tech. 齿节周期
pitch period: 4 phrases in 3 subjects
Information technology2
Nautical1
Oil / petroleum1