You are learning seasonal shanghai shopping: you will read the scene it happens in, learn 10 words and phrases, take apart the pattern behind them (season vocabulary + seasonal shopping expressions), hear them in a conversation, rehearse them, and finish by saying one thing out loud to be graded.
Shanghai's food culture runs on 节气 (jiéqì) — China's 24 solar terms, each associated with specific foods, rituals, and flavor profiles. Understanding the season changes what you can buy and cook.
The stranger has arrived in Shanghai in late October. Every conversation in every market is about 大闸蟹. This is the peak of hairy crab season — the moment when the female crabs are at maximum roe, the male crabs beginning to develop their fat. Shanghai restaurants put them on every menu; wet markets build pyramids of them; taxi drivers discuss which lake's crabs are superior this year.
「现在正是大闸蟹的季节对吗？」 The fishmonger lights up. 「对！今年最好！阳澄湖的最新鲜！」 Yangcheng Lake — the finest. 「多少钱一只？」 — 「母蟹一百二，公蟹八十。」
「什么时候最好吃？」 The fishmonger becomes a professor. Female crabs peak in October (the roe is bright orange), male crabs in November (the fat fills the shell). 「你来得正是时候！」 You arrived at exactly the right time.