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seafood is...
seafood 通常为不可数名词，谓语动词用单数。
Seafood is often served with lemon.
海鲜通常配柠檬一起上桌。
海鲜；海味；水产品
先理解核心含义，再看它在真实句子里的用法。
海鲜；海味；水产品
seafood
Seafood is often served with lemon.
海鲜通常配柠檬一起上桌。
来自海洋的食物,包括鱼类、贝类、甲壳类、头足类、海藻、藻类、海洋哺乳动物及其他海洋生物。
Food from the sea, including that derived from fish, shellfish, crustaceans, cephalopods, seaweed, algae, marine mammals, and other marine organisms.
可食用的鱼类(广义上包括淡水鱼)或贝类或鱼卵等
edible fish (broadly including freshwater fish) or shellfish or roe etc
来自任何水域的食物,包括海水和淡水。
Food from any aquatic source, including not only salt water but also fresh water.
I ordered seafood at the restaurant, and the grilled fish was delicious.
我在餐厅点了海鲜，烤鱼很好吃。
She avoids seafood because she is allergic to shellfish.
她不吃海鲜，因为她对贝类过敏。
The market sells fresh seafood every morning, including shrimp and crabs.
这个市场每天早上出售新鲜海鲜，包括虾和螃蟹。
seafood 通常为不可数名词，谓语动词用单数。
Seafood is often served with lemon.
海鲜通常配柠檬一起上桌。
seafood 可直接修饰名词作定语，如 seafood soup（海鲜汤）、seafood pasta（海鲜意大利面）。
She works in a seafood market.
她在海鲜市场工作。
常用 eat 或 have 搭配表示“吃海鲜”。
We had fresh seafood at the harbor.
我们在港口吃了新鲜的海鲜。
Not this
I like seafoods very much.
Use this
I like seafood very much.
seafood 是不可数名词，表示“海鲜”这一总称时不能加 s，因此应说 seafood。只有在强调“不同种类的海鲜”时才可用 seafoods，但普通表达喜好时不用复数。
Not this
There are many seafood in the market.
Use this
There is a lot of seafood in the market.
seafood 不可数，不能用 many 修饰，也不能与复数动词 are 搭配；应改用 a lot of 这类可修饰不可数名词的量词，并用单数动词 is。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
海鲜餐馆
We had dinner at a seafood restaurant by the harbor.
我们在海港边一家海鲜餐馆吃了晚餐。
新鲜海鲜
The market sells fresh seafood every morning.
这个市场每天早上都卖新鲜海鲜。
海鲜拼盘
The seafood platter for two includes shrimp, crab, and clams.
两人份海鲜拼盘包括虾、蟹和蛤蜊。
烤海鲜
She ordered grilled seafood with lemon and herbs.
她点了加柠檬和香草的烤海鲜。
海鲜沙拉
A light seafood salad makes a perfect summer lunch.
清淡的海鲜沙拉是完美的夏季午餐。
海鲜市场
We bought the fish directly from the local seafood market.
我们直接从当地海鲜市场买了鱼。
海鲜减肥法（双关语，指“看见食物就吃”）
I'm on a seafood diet: every time I see food, I eat it.
我在实行“海鲜减肥法”：每次一看到食物我就会吃掉。
发长 /uː/ 音 (如 food, boot)
Use seafood naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 sea（海）和 food（食物）拼在一起记：海鲜就是海里的食物。
语域：neutral 常见场景：日常购物与烹饪、餐厅菜单与点餐、健康与营养讨论 该词为中性词，通常作不可数名词使用，表示作为食物的海产总称；在日常购物、餐厅和饮食健康等场合都很常见。
在这些词中，food、mood、dude、rude 都以 /-ud/ 结尾，与 seafood 词尾的 food 读音相同；而 good 和 blood 虽然也拼作 -ood，却分别读作 /ɡʊd/ 和 /blʌd/，注意不要按 food 的读音类推。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
Watch the sound change