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Fake apple girl and apple girl look alike, but it's not hard to tell:
The leaves of apples are oblong to rectangular, much wider than those of fake apples, 8-25 cm long and 5- 15 cm wide. The leaves of fake apples are oval, rectangular, nearly lanceolate, 7- 15 cm long and 2.5-7 cm wide.
Generally, the fruit of an apple has 1 to 3 seeds per pod, the size of which is between broad bean and pigeon eggs, much larger than that of a fake apple. Generally, the fruit of purple sweet potato has 5 to 7 seeds per pod, which is as big as peanuts.
In addition, the branches and leaves of apples are denser than fake apples, and they can hardly penetrate the sunlight.