每当听到藏歌《我和草原有个约定》时，我就会情不自禁地想起自己与内蒙古草原失之交臂的事儿，一时里感慨万端，千言万语似乎无从说起。
B-Time I-Time I-Time I-Time I-Time I-Time B-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract I-Abstract B-Time O B-Person O O O O O O O O O B-Person I-Person O O O O B-Thing I-Thing O O O O O O O O O O O O O O O O O O O O O O O O O O O