Choice of Words: Lungs are the organs in the chest that are responsible for breathing.
Alternative Expressions
My lungs take in air.
Meaning: This means that my lungs are receiving air from the outside world.
Choice of Words:My shows that we are talking about the speaker's lungs. Take means to receive or get something. Air is the mixture of gases that makes up the atmosphere of the Earth. When you put them together, "My lungs take in air" describes the process of how we breathe in air into our lungs.
We need oxygen to live.
Meaning: This means that we cannot live without oxygen. It is essential for our survival.
Choice of Words:We refers to all humans. Need means to require something in order to survive or function properly. Oxygen is the gas in the air that we need to breathe in order to live. Live means to be alive. When you put them together, "We need oxygen to live" expresses the importance of oxygen for our survival.