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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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.

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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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