有些国家筑起贸易保护主义的高墙、退回单边主义的老路，增加了国际社会对自由贸易前景的忧虑，也给正回暖的世界经济增添了诸多不确定性。
Some countries have built trade protectionist walls and retreated into the unilateralism, which increases anxiety of the international society about the prospects for free trade and adds much uncertainty to a recovering world economy.