United States of America 加州大学 土木工程专业 硕士学位 22年授课经验 翻译、作家、出版商 各种授课经验 超级丰富
So which one is more suitable for william?we may try to change book for him?
Dear James,Which textbook is more suitable for William to apply advanced vocabulary?
有耐心且博学的老师
老师非常有学问 能把天体运动讲的很好
nice