Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
crystal – n. a small piece of a substance that has many sides and is formed when the substance turns into a solid
ion – n. an atom or group of atoms that has a positive or negative electric charge from losing or gaining one or more electrons
fertilizer – n. a substance or a special chemical that is added to soil to help the growth of plants
alternative – n. offering or expressing a choice
vinegar – n. a sour liquid that is used to flavor or preserve foods or to clean things
holistic – adj. relating to or concerned with complete systems rather than with individual parts
park – v. leaving a car at a specific place
