what are the differences among particular, special and unusual ?

particular
KK: []
DJ: []
a.
1. 特殊的;特定的;特别的[Z][B]
The teacher showed particular concern for the disabled child.
老师特别关心那个残疾儿童。
2. 特有的,独特的;异常的[Z][B]
Her particular way of smiling left a good impression on me.
她特有的微笑给我留下了美好的印象。
3. (过于)讲究的;苛求的,挑剔的[(+about/over)][(+wh-)]
She is particular about what she eats.
她过分讲究吃。
4. 细致的,详细的[B]
The witness gave us a particular account of what happened.
目击者把发生的事情详细地对我们说了一遍。
n.
1. 个别的项目,细目[C]
The particular may have to be satisfied to the general.
为顾全总体个别的项目也许不得不放弃。
2. 详细情况[P]
I suppose the secretary knows the particulars of the plan.
我想那位秘书知道这一计划的详细情况。
3. 特点,特色[C]

special
KK: []
DJ: []
a.
1. 特别的,特殊的
He never drinks except on special occasions.
除非在特别场合,他从不喝酒。
2. 专门的,专用的
She works as a nurse in a special hospital.
她在一家专门医院做护士。
3. 额外的,增设的
4. 具体的
n.[C]
1. 特别的东西;专车,专机