- master timer
- 主要: main; chief; principal; majo ...
- 定时: timing; at regular time; fix ...
- 装置: installation; device; appara ...
- 定时装置: device; timing; master timer; time adjusting device; timer device; timer set; timers; timing device; timing equipment; timing system; timing unit
- 阀定时装置: valve timing gear
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