你好
efficient 与 effective的区别
a. efficient 是指工作效率高；其名词形式为efficiency，意为“效率，功效”。
b. effective 是指某种事物起了作用，产生了效果; 其名词形式为effectiveness，意为"效果，有效"。
[例句] an efficient secretary 工作效率高的秘书
increase efficiency of production and diminish cost of output 提高生产效率，降低产品成本
an effective medicine for hair loss 一种治疗脱发的有效药
His order to arrest me was no longer effective. 他发出的逮捕我的命令已不再有效。
Light clothes are effective in keeping cool in warm weather. 热天穿淡色衣服使人凉爽。
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