investigation; inquiry; to investigate; to survey; survey; (opinion) poll[cedict]
过
guòㄍㄨㄛˋ
(experienced action marker); to cross; to go over; to pass (time); to celebrate (a holiday); to live; to get along; excessively; too-; surname Guo[cedict]
他
tāㄊㄚ
he; him[cedict]
不单
bù dānㄅㄨˋ ㄉㄢ
not the only; not merely; not simply[cedict]
是
shìㄕˋ
is; are; am; yes; to be[cedict]
买卖
mǎi màiㄇㄞˇ ㄇㄞˋ
buying and selling; business dealings; transactions[cedict]