The mineralization system was a semi-closed state in the main metallogenic stage.
在主要成矿阶段，体系处于一种半封闭状态。
The system is a semi-closed loop system that knock sensor was used.
由于采用外部的爆震传感器，整个系统成为一个半闭环系统；
Semi-closed guard protection, safe and reliable.
半封闭防护，安全可靠。
Semi-closed guard protection, safe and reliable.
半封闭防护，安全可靠。
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