特殊用法annual commencement1.学年结业典礼commencement of business1.开始营业commencement of cover1.保险责任开始commencement of fuel injection1.喷油提前角commencement of fuel supply1.供［喷］油始点commencement of injection1.供［喷］油始点commencement of the limitation period1.时效期间的开始