... 1.交易性的需求(transaction requirement) 2.预防性的需求(precautionary requirement) 3.投机性的需求(speculative requirement) ...
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至少有500万艾滋病毒感染者仍然无法获得可以延长其生命的治疗和关怀，许多有需求的人员得不到预防性服务。
At least 5 million people living with HIV still do not have access to life-prolonging treatment and care. Prevention services fail to reach many in need.
“一些预防性安排的需求会产生，”他说，没有指明具体的国家。
"Some need for precautionary arrangements may appear," he said, without naming specific countries.
医师助理是在医生监督下提供疾病诊断和预防性医疗保健服务的医疗专业人员。目前对医师助理的需求量非常大。
Physician assistants are medical professionals who provide diagnostic and preventative health care services under the supervision of doctors-and they're in high demand.
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