But the pressure to reimpose barriers in all three areas is now growing in advanced economies .
但目前在发达经济体，对所有这三个领域重新设置壁垒的压力正日益增长。
John kerry , chairman of the us senate foreign relations committee , called for oil companies to halt operations in libya and suggested the us reimpose sanctions on tripoli .
The problem has been amplified by unseasonally large snowfalls in northern and central china , but the root cause is beijing 's attempt to reimpose and tighten price controls on numerous commodities , such as coal and oil .
Two companies in the past week have dropped below their ipo price on their trading debut , the first time this has happened in china for at least five years , raising fears that the government may reimpose a ban on listings .
