It is too expensive for farmers to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little.

对于农民来说，按常规来使用它则过于昂贵，而且由于它在接种疫苗后一个月才有效，所以在疫情爆发后才使用几乎没有什么帮助。

youdao

While they sound efficient and cost-saving, a recent study reports that they are not effective, primarily because depressed patients are not likely to engage with them or stick with them.

虽然它们听起来很高效而且节约成本，但最近的一项研究表明，它们并不有效，主要是因为抑郁症患者与之接触的可能性低，也难以坚持下去。

youdao

If it is not effective, a second-line treatment is given.

如果无效，进行二线治疗。

youdao

"The strident criticism, I think,is not effective, usually does not work.You know, when you shout at your wife in an argument it usually does not get her to agree with you.

VOA: standard.2009.11.17

It's not your horizon; it's not my horizon; it's that effective history which takes place when our horizons merge.

这不是你的视域，也不是我的视域;,而是我们的视域融合时产生的有效历史。

耶鲁公开课 - 文学理论导论课程节选

I don't know. Does anybody--It has been-- The colleague answered and said that it's not as effective as other methods.

我不是很清楚,有同事回答说,这种方法并不如其他方法有效

耶鲁公开课 - 心理学导论课程节选

Likewise, a web crawling robot which follows links such as Google is not effective.

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Environmentalists say despite the law, the department is understaffed and therefore policing is not effective.

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Thus Cohen should have told us that acupuncture is not effective for any of these other conditions.

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