英语翻译When it heats up,one metal strip expands more than the o

英语翻译
When it heats up,one metal strip expands more than the other,forcing the bimetallic strip to bend.When a certain temperature is reached,the circuit breaks and the electric irion is turned off.When the bimetallic strip cools down,it straightens again.
The circuit becomes closed and the electric iron is turned on again.