historic 历史上著名的，有历史意义的
英文释义:being historic means being famous or important in history.
例:This historic photo was taken a long time ago.这张具有历史意义的照片拍摄于很久之前。
与historical的区别:historical仅指“与历史有关的(不一定具有历史意义)”
decade 十年；a decade means ten years.
例:I've been working here for a decade.
attempt 努力，尝试；to attempt means to try to do something.
固定句式:“attempt to do something”or “attempt something”
例:He attempted to make a change.
situation 处境，情况，形势；a situation means a set of things that are happening at a certain time and place.
固定句式:“in a good/bad/difficult situation”表示处于某种处境之中
常用语:“win-win situation”双赢的局面