In C4 plants there are two types of chloroplast.

在C4植物中有两种类型的叶绿体。

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In fact, the distinction between C3 and C4 plants is not always clear-cut.

实际上，c3与c4植物并非总是有着明显的区别。

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In hot, sunny climes, these C4 plants are half as efficient again as their C3 counterparts.

在炎热，阳光充足的气候下，C4植物的效率比跟它们相似的C3植物高出一半。

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In hot, sunny climes, these C4 plants are half as efficient again as their C3 counterparts.

ECONOMIST: Genetic modification

Other researchers, meanwhile, are trying to isolate the genes responsible for C4 plants' unusual anatomy and biochemistry.

ECONOMIST: Genetic modification

In fact, the distinction between C3 and C4 plants is not always clear-cut.

ECONOMIST: Genetic modification