Some businesses have begun to realize it may not be effective to let consumers take full responsibility for recycling.

一些企业已经开始意识到，让消费者承担回收的全部责任可能没有效果。

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This process may not be effective for a Web server, but it can work well for job servers.

这个过程可能对于Web服务器不可行的，但是它对于工作服务器仍然是有效的。

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This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.

然而，这种方法在肿块较大时可能不是那么有效，并且其长期效果至今未知。

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The antivenom that cures the bite of one kind of snake may not be effective for another kind of snake.

VOA: special.2009.05.05

But what you should be able to do is take a look at a list of answers for what we're saying z effective might be, and determining which ones are possible versus which ones are not possible.

但是你们应该能够做到的,是看一下这个可能的,有效电荷量的答案列表，并且确定哪些是可能的,哪些是不可能的。

麻省理工公开课 - 化学原理课程节选

where the super model could not be an effective model for bikinis after a certain age.

比基尼模特在达到一定的年龄后就无法再担任这份工作了。

退休很神奇 - SpeakingMax英语口语达人

Ben Bernanke and Sheila Bair also believe that a two-tier system will not be effective.

FORBES: New Bill Creates Obstacle for Durbin Amendment

"If I felt I could not be effective, I'd resign in a minute, " Rumsfeld said.

CNN: Rumsfeld tells Congress of his 'failure'

Moreover, this particular vaccine would not be effective in sub-Saharan Africa, where AIDS has been most devastating.

FORBES: Magazine Article