Compound sentence: the system shall be able to display the elapsed time for the car to make one circuit around the track, and the time format shall be hh: mm: ss.
并列句：系统应能显示车沿跑道绕行一圈花费的时间，且时间的格式应是hh：mm：ss。
Compound sentence: the system shall be able to display the elapsed time for the car to make one circuit around the track, and the time format shall be hh: mm: ss.
并列句：系统应能显示车沿跑道绕行一圈花费的时间，且时间的格式应是hh：mm：ss。
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