当然，他们的很多认识来源于电影。

Most of their knowledge, however, has been gleaned from movies.

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必须认识到谷物是维生素和矿物质的一大来源。

You should be aware that grains are a big source of vitamins and minerals.

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必须认识到谷物是维生素和矿物质的一大来源。

You should be aware that grains are a big source of vitamins and minerals.

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