Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
proficient – adj. a certain level of skill
potential –n. the ability of something to become real to come into being
statistics –n. numbers that provide information answering questions like how many, how often, to what degree?
auditory –adj. related to hearing
tiles –n. a flat piece of material
apps –n. computer applications found on phones, tablets and computers
reverse –v. to change to the opposite state or condition
stroke –n. one part of a written or painted character or painting
semantic –adj. related to meaning
phonetic –adj. related to sound
frustrated –adj. the result of not being able to gain or complete something
