Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
deterioration – n. the action or process of breaking down; becoming worse
consult – v. to advise
submit – v. to propose; to put forward
concrete – adj. identifying something real or a group of things
trigger – v. to release or cause
legitimacy – n. the quality of being lawful or rightful
summit – n. a meeting or conference
convince – v. to persuade
signatory – n. a nation, organization or person that has signed an official document
