"Energy is conserved in this process"
"We preserve these archeological findings"
"The old lady could not keep up the building"
"children must be taught to conserve our national heritage"
"The museum curator conserved the ancient manuscripts"
"I try to economize my spare time"
"conserve your energy for the ascent to the summit"
"Mom always conserved the strawberries we grew in the backyard"
He conserved his energy for the game.
他为比赛而养精蓄锐。