[经] average outgoing quality limit

píng jūn tōng guò liàng zhì dì xiàn dù ㄆㄧㄥˊ ㄐㄩㄣ ㄊㄨㄥ ㄍㄨㄛˋ ㄌㄧㄤˋ ㄓˋ ㄉㄧˋ ㄒㄧㄢˋ ㄉㄨˋ