Meaning: Their happy and amused sounds make the air around them full.
Choice of Words: Laughter - happy or amused vocal expression; fills - makes full; air - the mixture of gases surrounding the Earth.
Alternative Expressions
Their laughter echoes through the hall.
Meaning: This means that the people are laughing so much that the sound of their laughter is filling the hall and can be heard everywhere.
Choice of Words:Their is used to refer to the people who are laughing. Laughter is the sound people make when they find something funny. Echoes means to repeat or bounce back sound. Hall is a large room or passageway in a building. When you put them together, "Their laughter echoes through the hall" means that the sound of their laughing is bouncing off the walls of the hall and can be heard throughout the space.
Their laughter reverberates in the room.
Meaning: This means that the people are laughing so much that the sound of their laughter is filling the room and can be heard even after they have stopped laughing.
Choice of Words:Their is used to refer to the people who are laughing. Laughter is the sound people make when they find something funny. Reverberates means to continue to sound or vibrate after the original sound has stopped. Room is a space within a building that is separated from other spaces by walls, doors, or windows. When you put them together, "Their laughter reverberates in the room" means that the sound of their laughing is bouncing off the walls of the room and continuing to be heard even after they have stopped laughing.