制止

stop; prevent; check; curb; suppress; restrain; halt; put an end to; crack down on; prevention; restraint; suppression

非法

illegal; unlawful; illicit; illegitimate; unauthorized; outlawed; shady; under-the-counter; unrecognized; improper; unorthodox; lawless; banned; forbidden; bandy around; hold ground; illegalize; criminalize; outlaw; ban; prohibit; on the side; under the counter

交易

trade; deal in; transact; negotiate; traffic; exchange; deal; market; business; bargain; trading; transaction