Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
initiative – n. plan or program that is intended to solve a problem
transit – n. the act of moving people or things from one place to another
greenhouse gas – n. a gas that traps heat in the atmosphere and contribute to climate change
unit – n. an amount of length, time, money, etc., that is used as a standard for counting or measuring
vest – n. a sleeveless piece of clothing with buttons down the front that is worn over a shirt
