system
他们家有一套防盗警报系统保护。
Their home is protected by a ___system of burglar alarms.
整栋房子都由中央供暖系统供暖。
The whole house is warmed by a central-heating ___system.
音乐厅的新音响系统能产生清澈透亮的音效。
The concert hall's new sound ___system produces crystal-clear audio.
在英国的教育体系下,学生在16岁和18岁时参加考试。
Under the British education ___system, students take exams at 16 and 18.
伦敦的公共交通系统包括巴士、火车和地铁。
The public transport ___system in London includes buses, trains, and the Tube.
大多数国家使用公制来计量重量和尺寸。
Most countries use the metric ___system for weights and measures.