不一定有效，但的确能用在许多问题文档上。
This isn't necessarily foolproof, but it does work on a lot of problematic documents.
位于指针指向的位置的值并不是一定有效的。
The value at the location pointed to by the pointer is not necessarily valid.
多样化不一定有效。
所以，我们说，本来一些合情合理的常规做法，到了装修行业，可能就不一定有效了。
Therefore, we say that's a number of reasonable standard practice, to the renovation industry, may not necessarily effective.
有时推荐使用口服止痛药，如布洛芬。但科学家们说，没有证据显示这种解痒药一定有效。
Oral analgesics like ibuprofen are sometimes recommended, but the scientists say there's no evidence supporting that.
然而，传统的治疗方法会有几个月甚至几年的时间去完成，而且道路充满艰辛，却不一定有效果。
However, traditional therapeutic methods can take months to years to do so and can be very challenging in the process or not really work.
模仿别人对于那些有几十个流浪者组成的同类群体来说有意义，但对于数百万陌生人就不一定有效了。
What made sense to a relatively homogeneous gaggle of several dozen nomads needn't hold for millions of strangers.
“就因为手术后的初期看起来还不错，所以使得每个人都沾沾自喜，但这并不意味着它一定有效或者说你的工作已经完成。” 梅伯格博士说。
“Just because it looks good at first and everyone gets excited, ” Dr. Mayberg said, “doesn’t mean it’s necessarily efficacious or your work is done.”
如果影响力有限，点对点的促销效果也不一定有效，且还有一些用户采取关注获取利益再取消关注的方式，商家获取的回报是否真的足够大呢？
If the influence is limited, point-to-point promotion effect is not effective, and there will be some users to take attention to cancel the attention, really big enough merchants to obtain the reward?
小偷一定有一个高机巧是有效的。
为了有效地提高企业的销售你，你一定有这样的信息。
To effectively increase sales for your business, you must have this type of information.
一定有更简单、更有效的方式评估一个人的能力，这可能会是个愤世嫉俗的建议。
There must surely be many simpler and more effective ways of assessing a person's true abilities. It is cynical to suggest that examinations are merely a profitable business .
一定有更简单、更有效的方式评估一个人的能力，这可能会是个愤世嫉俗的建议。
There must surely be many simpler and more effective ways of assessing a person's true abilities. It is cynical to suggest that examinations are merely a profitable business .
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