a lettle of challage 挑战书
challage and reorganization 挑战与整顿
The US "OPA 90"and the new regulations for marine engine emission worked out by IMO will bring forth the challage to the shipbuilding and shipping enterprises for environmental protection.
美国油污法和正在制订的IMO新的有关船舶大气污染的规定，都将使造船和航运业带来环境保护的新挑战。
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