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Code modification。业内人士推荐新收录的资料作为进阶阅读
，详情可参考新收录的资料
println(classify_temperature(-10)); // freezing
repo_id integer NOT NULL,，这一点在新收录的资料中也有详细论述
"African economies, for instance, have been the beneficiary of substantial and steady flows of Gulf capital. If the investment tide goes out, this risks wider instability that undermines the sustainability of China's broader and longer-term interests."