use: implies availing oneself of something as a means or instrument to an end: willing to ~ any means to achieve her goals.


employ: suggests the using of a person or thing that is available but idle, inactive or disengaged by putting him, her, or it to some work or profitable activity: your time might have been better ~ed by reading.    就业employment


utilize: may suggest the discovery of a new, profitable, or practical use for something that might be overlooked or wasted: meat processors ~ every part of the animal.         又如to utilize coal利用煤炭


apply: stresses the bringing of one thing into contact or relation with something else in such a way that it proves useful or acquires practical value: ~ied specific rules to the situation.     如applied physics/mathematics应用物理学/数学


use使用: 使用某物达到目的，可见很通用，employ使用雇佣: 使用可用但闲置的人或物，使其工作创收，utilize利用: 发现新的实用之处，通常针对容易被忽略浪费，apply应用: 使接触关联，从而证明有用处有价值


记忆方法：1) 首字母排序为UEUA友谊友爱<==爱惜使用

         2) 使用的意思是使投入服务mean to put into service especially to attain an end or to give a practical value.首字母排序为UEUA友谊友爱<==爱惜使用