表面的原因并不复杂——大宗商品价格下跌。超级周期结束，铜价回落，矿业投资减弱，这是几乎所有资源出口国都会面临的冲击。但更深层的原因在于，秘鲁极不稳定的政治环境。
An creates a completely separate browsing context with its own window object, its own document, and most importantly;its own prototype chain. A function hooked on HTMLMediaElement.prototype in the parent window is not the same object as HTMLMediaElement.prototype in the iframe’s window. They’re entirely separate objects. If fermaw’s audio element lived inside an iframe, my prototype hook in the parent window would never fire.
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Enhance the readability of your sentence
Will Ferrell sports movies - BLADES OF GLORY, KICKING & SCREAMING, SEMI-PRO, TALLADEGA NIGHTS
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Photograph: Julian Chokkattu。关于这个话题，im钱包官方下载提供了深入分析
2月27日，来自上海合作组织的嘉宾们在瑞金医院了解无创血糖仪。