比 (bǐ): This character typically means “to compare.” However, when repeated as 比比 (bǐbǐ), it takes on the meaning of “everywhere,” “one after another,” or “in every case.”
皆 (jiē): A formal or classical character meaning “all” or “every.” It's a stronger, more literary version of 都 (dōu).
是 (shì): The verb “to be” (is, am, are).
The characters combine to literally mean “everywhere, all are.” The structure emphasizes both the vast quantity and the wide distribution of something, painting a picture of a phenomenon that is impossible to miss.