In Euclidean geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the a ......
A stem-cell treatment put a London cancer patient's HIV into remission, marking the second such reported case and reinvigorating efforts to cure the A ......
6.17
http://www.51voa.com/VOA_Special_English/are-these-us-treasures-about-to-be-destroyed-82260_1.html
neighborhood
National Trust for Historic Pre ......
academy
at/in school都行,academy一般用at。
The word comes from the Academy in ancient Greece, which derives from the Athenian hero, Akademos. Outside t ......
accomplish
=achieve; accomplishment=achievement. accomplished: well educated/trained, skilled. skilled是被skill过,skillful很有skill (full of skill)
de ......