[经] index numbers of quantum imports or exports
jìn chū kǒu wù liàng zhǐ shù ㄐㄧㄣˋ ㄔㄨ ㄎㄡˇ ㄨˋ ㄌㄧㄤˋ ㄓˇ ㄕㄨˋ