Always buy a heater with thermostat control to save on running costs.始终购买可调温度的取暖器以节省使用成本。If our environment cools, then messages from the skin alert the body's thermostat.如果外在环境变冷，体表会将这一信息传递给身体的体温调节中枢。The thermostat...
There have been several volcanic eruptions this year.今年火山爆发了好几次.Over 200 people have been killed by volcanic eruptions.火山喷发已导致200多人丧生。The later eruptions were less violent and caused no significant damage.后来的几次喷发就不太猛烈了,也...