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.         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，如本例应用规则/法律，APP是application应用程序的简称


use使用: 泛指使用某物达到某目的，employ使用雇佣: 使用可用但闲置的人或物，使其工作或赢利，utilize利用: 发现新的实用之处，避免被忽略浪费，apply应用: 使关联，从而实际体现用处价值


记忆方法: 1) 首字母排序为UEUA友谊友爱<==爱惜使用   "用"的本义是"使人或物发挥功能"，是象形字表示"桶"的形状，三竖表示木板，横线表示把木板串连。桶可以使用，所以用它的形状表示"用"，如用人用餐用洗手间用心用钱  

         2) 使用的意思是使投入服务发挥功能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