取而代之的是那些快递员们，他们驾着电力助动车，整日不停地在小区里“突、突、突”地往来穿梭。
O O O O O O B-Person I-Person I-Person I-Person I-Person I-Person O B-Person I-Person O O B-Thing I-Thing I-Thing I-Thing I-Thing O B-Time I-Time O O O O B-Location I-Location I-Location O O O O O O O O O O O O O