What is Contain ?
Contain is (verb) 1. to hold, to have inside the bottle contains acid The envelope contained a cheque for £1000. A barrel contains 250 litres. I have lost a briefcase containing important documents. 2. to limit or prevent something The army tried to contain the advance of the enemy forces. The party is attempting to contain the revolt among its members.
source: Easier English, Student Dictionary Upper Intermediate Level