请看这儿：fruit - WiktionaryUsage notesIn the botanical and figurative senses, fruit is usually treated as uncountable:a bowl of fruit; eat plenty of fruit; the tree provides fruit.fruits is also sometimes used as the plural in the botanical sense:berries, achenes, and nuts are all fruits; the fruits of this plant split into two parts.When fruit is treated as uncountable in the botanical sense, a piece of fruit is often used as a singulative.In senses other than the botanical or figurative ones derived from the botanical sense, the plural is fruits.The culinary sense often does not cover true fruits that are savoury or used chiefly in savoury foods, such as tomatoes and peas. These are normally described simply as vegetables.
