get,gain,obtain,attain,acquire,作”得到”意思时有何不同?

这一组动词都有"获得,取得"的意思,在考研和CET-6当中屡次出现它们之间的辨析.
acquire v.多指经过努力逐步获得才能、知识、习惯等,也可用于对财物等的获得,该词强调"一经获得就会长期持有"的含义.
It is through learning that the individual acquires many habitual ways of reacting to situations.正是通过学习,个人才得以获得应付各种情况的习惯做法.
attain v.指经过不懈的努力获得未曾预料到的结果；也可指达到某一目标.
The salesperson attained his sales goal for the month.这名销售员完成了当月的销售目标.
obtain v.获得,买到,用于正式语体中.
He obtained the property with a bank loan.他通过向银行贷款买下了那份房产.
gain v.指通过较大努力获得某种利益或好处；亦可指军事上的武力夺取等.
An investor gains by buying stocks that go up in value.投资者通过所买股票价格上涨而
得利润.
earn v.挣得,赢得,指因工作等而得到报酬或待遇.
How much do you earn a week?你一星期挣多少钱?
achieve v.得到,获得,多指成就、目标、幸福的取得.
The movie star achieved success and wealth.这个影星取得了成功和财富.
secure v.得到；把……拿到手,含有肯定占有难以得到的东西之意；使安全,保卫；作形容词比较常见,意为"安全的".
A million signatures have been secured.已征集到了100万人的签名.
He secured the office before leaving it for the night.他晚上离开前锁好了办公室的门窗.