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

This method was very effective as the glass had not touched any surfaces between being soft and becoming hard, so it stayed perfectly unblemished, with a "fire finish".

这个方法非常有效，因为玻璃在从软变硬的过程中并没有触及任何物体的表面，因而在经过“火抛光”处理后能保持完美无瑕。

youdao

Statistics that come from "historical surveys" are really not very effective tools because the filter of interpretation plays too large a role.

来自于“历史调查”的统计数据真的不是很有效的工具，因为对其的筛选过程扮演了非常重要的角色。

youdao

Dr.Lepora says she will probably return to MSF, because she says once she learned how to be effective in a crisis situation, she finds it very difficult not to act when another crisis comes up.

VOA: standard.2010.06.29

But the prospect of voting for two very expensive and not very effective packages will make a few Democratic senators swallow hard.

ECONOMIST: So many challenges. So little spare cash

But, the paper went on, "the military solution in Syria is not very effective and will lead nowhere".

BBC: Middle East

They get cages, screws and rods implanted in the spine, despite studies that show fusion is not very effective for lower back pain.

FORBES: Magazine Article