This is a figurative sentence. Books are like mountains, and learning knowledge is like the sea. The whole sentence is that there are roads and diligence in Shushan, and there is no limit to learning the sea. This sentence comes from Han Yu, the first of the eight masters in the Tang and Song Dynasties. It is a famous saying of his scholarship, which aims to encourage people to study more without fear of hardship. It is also included in Zengguang Xianwen.

The whole sentence means that a book is like a mountain peak. If you want to reach the top of the towering mountain of knowledge successfully, diligence is the only way to reach the top. Knowledge is like an ocean, and a hard-working attitude will be a moving ship that can take you to the other side of success.

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this sentence is a dual sentence, in which "learning from the sea" means "learning from books", "boundless" means "having a road" and "struggling to make a boat" means "diligence", regardless of rhyme, part of speech, connotation and artistic conception.

"Xuehai" and "Shushan" are related, but they are not the same concept, and they cannot be confused. There is no limit to learning the sea, which stems from Zhuangzi's "knowledge has no limit", and there is no end to learning and research. However, the path of the book mountain is objective and practical. As a material form, books always have their limits.

Path and boat, the path can also be extended to walking, climbing mountains, or paving roads. Boat means taking a boat, taking a boat, or building a boat, because knowledge is very extensive, but it takes constant efforts to pave a way to climb this mountain of books; Learning is endless, and only by unremitting efforts can we sail into the ocean of knowledge by boat.

Tell us, don't be afraid that there is a lot of knowledge, what's more, it is endless, and we can't finish it in a few lifetimes. If we are willing to work hard, we will certainly get more.