WHO recommends that every at-risk country have at least one national laboratory where basicyellow fever blood tests can be performed.
世卫组织建议，每个存在感染风险的国家应至少建立一个可进行基本的黄热病血液检验的国家实验室。
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The basic styles help offset more flamboyant accessories, like a pair of fluorescent yellow heels and tasseled black bag that Ms. Mellon likes to pair with jeans for a hard-edged bohemian look.