Answer
You would decode that from my explanation
Step-by-step explanation:
Sometimes we use preceding statements and proceeding statements to decode a missing word inorder to complete a given thought.
"Carrying them was difficult"...what that give you idea of ' weight'- you could decode that.
Similarly, "the problem was addressed by using lighter material to construct the frame".
The problem was stated by giving you it's opposite.. lighter material...
Meaning the problem was weight in the first place.