澳大利亚贸易投资委员会官员苏珊·卡瓦提致辞说，进博会是澳大利亚与中国商界互动的首选平台，必将推动澳大利亚的贸易发展。
Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.，详情可参考91视频
siftDown(arr, n, largest); // 递归下沉，更多细节参见同城约会
const stack = [];