obtain和attain 都含有"获得,达到"之意
obtain包含着“努力”、“希望”或“决意”去获得某物的意思
指经过努力或付出代价或经过很长时间得到所需要的东西
eg：The journalist immediately set out to obtain these important facts.
那位新闻记者立即着手获取这些重要的资料.
Ordinary people would then be able to use them to obtain valuable information.
那时平常的人便能运用它们去获取宝贵的信息.
attain 正式用语,指经过艰苦努力才使人达到完美境地
obtain(vi.)
if a situation,system,or rule obtains,it continues to exist
例：These conditions no longer obtain.
attain(vi.)
to come or arrive by motion,growth or efforts
通常和to连用,
attain to 到达,达到