Text

The antics of the anti-trade left have harmed efforts to achieve trade liberalization through international negotiations. While there is little in the way of substantive criticism coming from the activists, their continual presence at international meetings gives cover to old-style protectionists who would like to see more restrictions on the flow of goods and capital around the globe. Both the United States and Canada have addressed the problem by simply increasing security measures at international gatherings. Ultimately, however, more sweeping changes will be needed.

The main idea of the paragraph

The senseless behavior of the protesters did nothing to foster trade liberalization; instead, it harmed efforts to achieve it.

抗议者们的愚昧行为无助于促进贸易的自由化，相反，它损害为此付出的努力。

句子分析

While there is little in the way of substantive criticism coming from the activists, their continual presence at international meetings gives cover to old-style protectionists who would like to see more restrictions on the flow of goods and capital around the globe.

在此句中：

　　1）“their continual presence … protectionists”是主句，“in the way of”的意思是“in the aspect of在…方面”

　　2）“While there is … the activists”是个让步状语从句，修饰主句中的谓语动词“gives cover to”

　　3）“who would like … around the globe”是限制性的定语从句，修饰名词“protectionists

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