許心滎 幼稚園下 (2015/12/20) 1 therefore ，when you shower that you use the hot water gas machine， you need to notice the air of inner
in addition ,you must check the gas turn off turn on before you going outside and going to bed ,to insure your sercurity
. 國三上 (2017/02/18) 1 1. Therefore, taking a bath with the gas heater, we have to keep the air circulating.
2. Moreover, going out and going to bed, we have to check whether the gas is closed or not to make sure safety.