Definition: a way or method of doing things Level: B2
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.
