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The coach wearing a uniform told the new trainee that he should put on the safety belt first， start the engine, and then keep the car between the parallel straight lines.
句意：这位穿着制服的教练告诉这位新学员：他应该先系好安全带，发动引擎，然后使车子保持在两条平行线之间。
主干：The coach ... told the new trainee that ...
wearing a uniform 是现在分词短语作后置定语。that he should put on the safety belt first， start the engine, and then keep the car between the parallel straight lines.是that引导的宾语从句。put on the safety belt 系好安全带。
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