Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
autism spectrum disorder - n. any of a group of developmental disorders (as autism and Asperger's syndrome) marked by impairments in the ability to communicate and interact socially and by the presence of repetitive behaviors or restricted interests
spectrum - n. a continuous sequence or range
fine particulate – n. very small solid material or liquid in the air
compelling – adj. capable of causing someone to believe or agree
ratchet up – v. to cause to move by steps or degrees -- usually used with up or down
confidence – n. the feeling of being certain that something will happen or that something is true
therapy – n. the treatment of physical or mental illnesses
