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No states have significantly tightened restrictions in recent years .

近几年来没有那个州成功地加强管制。

The restrictions have presented particular challenges for u. s.film studios .

媒介管制已经对美国电影业提出了特别的挑战。

Moreover , currency restrictions prevent an arbitrage between the two markets .

另外，中国的汇率管制阻止了投资者在两个市场的套利行为。

The junta has some awesome restrictions on owning electronics , especially computers .

缅甸军政府对私人电子产品尤其是电脑有极其严格的管制。

Governments impose restrictions in the belief that cross-border marriages can destabilise their societies .

政府强行管制，是因为坚信跨国婚姻不利于社会稳定。