如果是球生菜，就沿着地平面割下来。

Cut off head lettuces at ground level.

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结球生菜冷链流通保鲜的关键是预冷。

The key of keeping fresh lettuce under cold chain is pre-cooling.

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除了最为常见的卷心生菜、波士顿生菜、比布生菜和长叶生菜之外，还有数百种不同种类的球生菜和叶生菜。

There are hundreds of kinds of head and leaf lettuces besides the most popular choices, like iceberg, Boston, bibb and romaine.

youdao

除了最为常见的卷心生菜、波士顿生菜、比布生菜和长叶生菜之外，还有数百种不同种类的球生菜和叶生菜。

There are hundreds of kinds of head and leaf lettuces besides the most popular choices, like iceberg, Boston, bibb and romaine.

youdao