obvious of，例如：
1、An obvious change of attitude at the top will permeate through the system.上级态度的明显改变将影响到整个体制。
2、There were obvious signs of the feel-good factor in the last survey taken in the wake of the election result.选举结果公布后的最近一次调查显示，人们普遍对未来持乐观态度。
3、Once you have eliminated the obvious causes of death， you must consider the possibility of foul play.一旦排除了明显的死因，你就必须考虑到可能有人采取了卑劣手段。
