旧金山去年干脆禁止塑料袋，商店不再提供塑料袋，但它们可以提供用土豆淀粉或玉米淀粉制造的生物降解替代品。
San Francisco last year banned plastic bags outright. Stores can no longer offer plastic bags, but they can offer biodegradable alternatives made from potato-starch or cornstarch.
旧金山去年干脆禁止塑料袋，商店不再提供塑料袋，但它们可以提供用土豆淀粉或玉米淀粉制造的生物降解替代品。
San Francisco last year banned plastic bags outright. Stores can no longer offer plastic bags, but they can offer biodegradable alternatives made from potato-starch or cornstarch.
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