Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
alarm bell - n. a bell that sounds when an alarm is activated
response - n. something that is done as a reaction to something else
greenhouse gas - n. gas that causes the warming of the earth's atmosphere, known as the greenhouse effect
previous - adj. earlier in time
meteorologist - n. a scientist of the atmosphere and weather
