if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错
"Most people, if they're running a company, they throw themselves into it and work, work, work to try and make it. And they're probably doing it for their kids.
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But agar’s superior qualities come with complex chemistry. “To speak of agar as a single substance of certain (if known) chemical structure is probably a mistake,” wrote phycologist Harold Humm in a 1947 article. According to the Food and Agriculture Organization of the United Nations, agar is merely recognized as “a hydrophilic colloid extracted from certain seaweeds of the Rhodophyceae class.” In terms of its actual composition, agar is mostly a combination of two polysaccharides, agaropectin and agarose, which themselves are complex and poorly-characterized polysaccharides made mostly (but not exclusively) from the simple sugar galactose.8
"Clearly this area needs further research to find out if it's causative or not."