Open the window to let in fresh air.
Meaning: This sentence is instructing someone to open a window to allow fresh air to enter.
Choice of Words: Open means to move something so that an opening is created. Window is an opening in a wall, door, or vehicle that allows light and air to enter. Let means to allow or permit something to happen. Fresh means new and not spoiled or stale. Air is the mixture of gases that surrounds the Earth.
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