1.牛津将apparent解释为obvious，说明两个词没本质区别都是，easy to see，understand etc，美国传统词典更是，用 Synonym同意字来说这两个词，但剑桥的解释则认为apparent是able to see，而obvious是easy to see，这可以看出apparent没后者明显。
例如：
For no apparent reason the man opposite suddenly screamed.(固定用法）
They have a small child so for obvious reasons they need money.（固定）
2.词义没区别，但固定用法有点区别：
an apparent problem一个答案明显的问题
an obvious solution一个明显的解决办法
It's obvious/apparent that..很明显
It's becoming apparent...变的明显
apparent 不做宾语，而obvious 有with obvious annoyance
The reasons are not immediately obvious.(no apparent)