Fish swam through coral reef.
Meaning: This means that the fish were moving through the coral reef, which is like a big underwater city made of coral.
Choice of Words: Fish are animals that live in water and have fins. Swam means to move through water by moving your fins. Coral reef is a structure made of the skeletons of tiny sea animals called coral. When you put them together, the sentence describes how the fish moved through the coral reef.
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