volatile [ˈvɒlətaɪl] adj. 易变的，动荡不定的，反复无常的；（情绪）易变的，易怒的，突然发作的；（液体或固体）易挥发的，...

Joe D Rushville, Indiana, USA (7500 people) Santo Domingo, Dominican Rep...

Hello and welcome to today’s lesson. I am happy to help you in today’s l...

Vocabulary Can I be honest with you? We have to take into account... You...

Welcome to class, Benjamin! Email: Letlhogonolo.bokaba@ef.com[mailto:Let...

default n. 不履行，违约；默认，系统设定值；缺席，弃权 v. 违约，不履行义务；默认，预设；弃权，未到场 adj. 默认的 defau...

EU 欧盟（European Union） Cambodia [kæmˈboʊdiə] n. 柬埔寨 Sentence construction...