大型管道系统保证了污水的有效处理。

The large ___system of pipes ensures efficient wastewater treatment.

学校的报警系统会在检测到烟雾时自动响起。

The school's alarm ___system automatically sounds when it detects smoke.

我们公司采用了一套新的绩效评估系统。

Our company has adopted a new performance evaluation ___system.

学校的供暖系统在冬天保持教室温暖。

The school's heating ___system keeps classrooms warm in winter.

现行教育体系需要改革以满足现代社会的需求。

The current education ___system needs reform to meet the demands of modern society.