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What's the difference between oranges, grapefruit and oranges? Are they close relatives in fruits?

A picture shows:

Difference: shape-the orange is oblate, slightly concave at the bottom, thin and smooth, easy to peel; Pomelos are mostly spherical or pear-shaped, with thick skin. They pinch like sponges, which are harder to peel than oranges and much larger than oranges. The shape of orange inherits the characteristics of grapefruit, but it does not inherit the excellent gene of orange skin. On the contrary, the skin is rough and there are many evenly distributed pits, the size of which is between oranges and grapefruit.

Color-the color of orange peel is mostly orange-red; Most pomelo peels are light yellow or yellow-green; The color of orange peel is between the two, orange and yellow.

Aroma-oranges have a special fragrance; Grapefruit has a special fragrance; Oranges have a special smell (the difference in smell is difficult to describe, you will know when you eat them. I think grapefruit is bitter, so I don't like it very much. Oranges oranges are more sour)

Taste-orange pulp is easy to crack, sweet and sour, and tastes fresh and juicy when bitten; Grapefruit also cracks easily. It tastes sweet, slightly bitter, bites tighter, and has much less juice than oranges. Oranges inherit the juicy characteristics of oranges, are not easy to crack, taste sweet and sour, and sometimes have some bitterness. The taste is tighter than orange but not as good as grapefruit.