3 On the other hand, C4 photosynthesis seems to have evolved more than 50 times, in 19 families of plant.
3 On the other hand, C4 photosynthesis seems to have evolved more than 50 times, in 19 families of plant.
另一方面，C4植物的光合形式已经演化了不下50次，形成了19个植物体系。
3 On the other hand, C4 photosynthesis seems to have evolved more than 50 times, in 19 families of plant.
另一方面，C4植物的光合形式已经演化了不下50次，形成了19个植物体系。