Meaning: The children are making structures out of sand at the beach.
Choice of Words: "Build" is a verb that means to construct something, while "sandcastle" refers to a structure made of sand, usually built by children at the beach.
Alternative Expressions
The kids make sandcastles by the ocean.
Meaning: This means the same as the first sentence, but uses different words.
Choice of Words:Kids is another word for children. Make is another word for build. By means near or next to. Ocean is another word for sea.
Young builders construct sand fortresses on the seashore.
Meaning: This means the same as the first two sentences, but uses more descriptive language.
Choice of Words:Young builders are children who like to build things. Construct is a more formal word for build. Sand fortresses are sandcastles that are built to look like real fortresses. Seashore is the land next to the ocean.