这种方法之所以有效，有两个原因。
上述情况中行动之所以有效是因为以知识为基础。
In that case action was effective because it was based on knowledge.
这些新的模式之所以有效，是因为他们具有牢固的经济基础。
These new approaches work because they have a solid economic foundation.
肖解释道：“小组面试之所以有效，是因为能一次面对一组求职者，并对他们进行比较。”
"The reason group interviews are so effective is you get to see the entire group at one time and are able to rank those candidates," Shaw explains.
这个测试之所以有效，是因为计算机无法完成；而计算机不能完成的任务正在变的越来越少。
They work only because there are things computers can't do, and there are fewer and fewer of those things all the time.
这些手段之所以有效可能是因为模仿别人有进化上的意义——躲避危险或者寻找食物和栖身之所。
It's likely that such ruses work because it made evolutionary sense to copy neighbours, to avoid danger or find food and shelter.
戈尔巴乔夫的策略之所以有效，是因为他公开实施了这个策略；如果只是秘密地单方面削减武器则会一事无成。
Gorbachev's strategy was effective because he did it publicly; unilaterally withdrawing in secret would have done nothing.
这招之所以有效，一是因为销售员通常比较了解公司内部人员结构。二是因为大部分销售员都愿意帮助其他销售同行。
The reason it works is because a salespeople tend to know who's who in their organizations and b because most salespeople will go out of their way to help another salesperson.
因为如果这样做，我们就会从观察和经验出发，如说“力”之所以有效，是由于我们习惯于在某种情形和意义下使用力这个词。
If we thus acted, we should proceed from observation and experience, and should, for instance, say we habitually employ the term 'force' in such a case, and such a meaning.
流行的节食食谱也许能让你远离碳水化合物，吃一大堆葡萄柚也是减肥的秘方之一，而这些之所以有效，全部与卡路里密切相关。
Fad diets may promise you that avoiding carbs or eating a mountain of grapefruit is the secret to weight loss, but it's really all about calories.
这之所以有效，是因为缺省消息传递提供程序是应用服务器的一部分，可以理解通过了应用服务器身份验证的Subject的格式。
This works because the default messaging provider is part of the application server and can understand the format of a Subject authenticated by the application server.
“以前，我们可能会认为，只要是异黄酮补充剂作用都差不多，但我们发现——明确的说，一种补充剂之所以有效，因为含有染料木素的缘故。”她说。
"Before, we might have assumed that any isoflavone was equally effective, but we found that for a supplement to work it was because of the genistein content specifically," she said.
之所以有困难是因为之前没有任何有效的治疗。
Professor Bruix: It has been difficult because before there was nothing that was effective. Everything was non-effective everywhere.
之所以有困难是因为之前没有任何有效的治疗。
Professor Bruix: It has been difficult because before there was nothing that was effective. Everything was non-effective everywhere.
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