They swim in the pool every summer.
Meaning: This means that they engage in the activity of swimming in a pool during the summer season.
Choice of Words: Swim means to move through water using one's arms and legs. Pool is a large container filled with water for swimming or bathing. Every means each and every one of a group. Summer is the warmest season of the year. When you put them together, "they swim in the pool every summer" means that they move through water using their arms and legs in a large container filled with water for swimming or bathing each and every summer.
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Related Expressions