Sandcastles lined the shore like miniature fortresses.
Meaning: Sandcastles were built in a row along the beach, and they looked like tiny forts.
Choice of Words: Sandcastles are structures made of sand, often built by children at the beach. Lined means to arrange something in a row or along a border. Shore is the land along the edge of a body of water. Miniature means very small, like a model. Fortresses are strong buildings designed to protect people from attack.
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Related Expressions