[经] over-the-counter security

mǎi mài shuāng fāng zhí jiē jiāo yì de zhèng quàn ㄇㄞˇ ㄇㄞˋ ㄕㄨㄤ ㄈㄤ ㄓˊ ㄐㄧㄝ ㄐㄧㄠ ㄧˋ ㄉㄜ˙ ㄓㄥˋ ㄑㄩㄢˋ