Usage patterns
〈物〉の両面に〈物〉を貼るto stick something on both sides of an object
I put stickers on both sides of the envelope.
〈事〉を両面から見るto look at a matter from both sides/aspects
We need to look at this problem from both sides.
〈事〉には良い面と悪い面の両面があるsomething has both good and bad sides
This plan has both good and bad sides to it.
Expressions
盾の両面を見よlook at both sides of the shield; examine a matter from all angles