阻止蕨菜蔓延的一种潜在的廉价和自我维持的方法是引入该植物的天敌。
One potentially cheap and self-sustaining method of halting the spread of bracken is to introduce natural enemies of the plant.
中东动荡局势引发的担忧让避险货币需求维持强劲态势，危险蔓延担忧致使美元和日元兑大多数货币均走高。
Middle East unrest concerns are keeping demand for safe-currencies strong as the Dollar and Yen strengthened against most currencies on fears of contagion spreading.
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