Without agar, countries could not produce vaccines or the “miracle drug” penicillin, especially critical in wartime. In fact, they risked a “breakdown of [the] public health service” that would have had “far-reaching and serious results,” according to Lieutenant-General Ernest Bradfield. Extracted from marine algae and solidified into a jelly-like substrate, agar provides the surface on which scientists grow colonies of microbes for vaccine production and antibiotic testing. “The most important service that agar renders to mankind, in war or in peace, is as a bacteriological culture medium,” wrote oceanographer C.K. Tseng in a 1944 essay titled “A Seaweed Goes to War.”3
过去，单个商店“即买即退”模式，游客要逐个商店办理退税。2025年4月，商务部等6部门发布《关于进一步优化离境退税政策扩大入境消费的通知》，鼓励有条件的地区在大型商圈、街区、景区等境外旅客较集中的区域，设立“即买即退”集中退付点。
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