一会儿，他们换了一个面朝窗户的位置，随手把塑料袋扔进垃圾箱。
B-Time I-Time I-Time O B-Thing I-Thing O O O O B-Location I-Location B-Thing I-Thing B-Location I-Location I-Location O O O O B-Thing I-Thing I-Thing O O B-Thing I-Thing I-Thing O