三个单词都有“清楚的”或“明显的”意思,有什么区别?请举出例句来说明.（obvious,apparent,clear）

obvious,apparent,clear：这些形容词共有的一个中心意思为“易见的,易察的,易明白的”.这组形容词都有“清楚的”或“明显的”意思.
△ obvious:所表示的“明显的”强调容易发现,常常用于修饰或说明那些本想掩盖而又没有能掩盖彻底的事情.指“容易知道或发现,无须解释或证明的”.
1.The rope had been cut,so it was obvious that the lamb had been stolen.绳子是被割断的,因此这只羊羔显然是被偷去的.
注：此句中的obvious 换用evident则更确切.
2.He is the stereotyped monster of the horror films and the adventure books,and an obvious (though not perhaps strictly scientific) link with our ancestral past.它们是恐怖电影和惊险小说中的老一套的怪物,并且与我们的祖先有着明显的(虽然可能没有科学的) 联系.
3.It's obvious that a man isn't strong enough to lift an elephant.很明显,一个人是不能举起大象的.
△ apparent：apparent的常见意义大致有两个,其一为“表面上的”或“看上去似乎像的”,这一含义的同义词为seeming；另一含义才是“明显的”.作为“明显的”这层含义,apparent与evident很难区别,apparent强调根据迹象进行仔细的推理,最后才看得出是“明显的”.还可指“思想上容易理解的”.
1.It later became apparent that rabbits were developing a degree of resistance to this disease.后来清楚了,野兔对这种疾病逐渐产生了一定程度的抵抗力.
2.Apparently what happened was that water collected on these tar pits,and the bigger animals like the elephants ventured out on to the apparently firm surface to drink,and were promptly bogged in the tar.显然,情况是这样的：这些焦油坑上积了水,类似大象这样较大的动物冒险走上了那似乎是坚硬的表面去喝水,就马上陷入焦油坑里去了.
3.It's apparent that you can't be trusted.很显然,你是不可信赖的.
△ clear：(以及常见的plain)是口语中常用词,其含义为“清楚易懂的”.clear 除了“清楚的”,“清晰的”之外,还有许多其它含义.如“流畅的”,“无障碍的”等.
1.The water of the lake is as clear as glass.湖水清彻如同明镜.
2.He gave a clear answer to the direct question.他对那个直截了当的问题作了清晰的答复.