This is fast technical English. Can you understand it?
Answer these questions:
Why are jet engines getting bigger?
Because a bigger engine is more efficient.
What are the two parts of a jet engine?
The engine core and the fan.
What provides most of the thrust in a jet engine?
What is the ideal size for a jet engine?
4 meters in diameter.
Will jet engines continue growing in size?
Yes, but not forever, 4 meters in diameter is the biggest they will get.