effect,  effective，effectiveness以及efficiency的区别

1.effect【结果，影响】

[可数名词, 不可数名词] ~ (on sb/sth) a change that sb/sth causes in sb/sth else; a result 效应；影响；结果

the effect of heat on metal

热对金属产生的效应

dramatic/long-term effects

引人注目的影响；长期效应

2.effective【有效的】——effectiveness有效性

producing the result that is wanted or intended; producing a successful result 产生预期结果的；有效的

More emphasis should be laid on the the effectiveness of the law.

应该更加强调法律的有效性.

3. efficiency 【效率】

[不可数名词] the quality of doing sth well with no waste of time or money 效率；效能；功效

improvements in efficiency at the factory

工厂效率的提高

I was impressed by the efficiency with which she handled the crisis.

她应对危机效率之高给我留下了深刻的印象。