What is the shape of banana fan?

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What is the shape of banana fan? What is the shape of banana fan? The definition given is that the upper and lower rails of Bolin are shaped like banana leaves. The specific point is that when the opening on the Brin line and off the rail is enlarged, although it is already at the peak of great risk. It should be at the moment of "having a tiger in mind and sniffing roses", but the path of Brin's up and down tracks slows slightly, that is, after a small or slight closure, he still moves along the original situation. So this is the origin of the name of this form.