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。
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。
the transfer of rural surplus labor force is not effective in promoting agricultural growth.
农村剩余劳动力的转移并未有效促进农业增长。
A: People in need are usually happy to receive assistance, but in some cases it is not effective and quite inappropriate.
答：有需求的人往往为受到援助而感到高兴，但在某些情况下援助效率不高，而且很不恰当。
He cites in evidence a drug trial by Amgen, a biotech giant, where the researchers concluded that the drug was not effective.
Grove博士举出了这样的一个例子：那是一个由生物技术界的巨头——安进公司所进行的一项药品实验。在这项实验里，研究人员总结道，该药品并不有效。
For incipient faults, the spectrum analysis is not effective.
直接采用频域分析方法诊断早期故障的收效甚微。
Evaluation is required if alternative drugs are not effective substitutes.
如果替代药物不是有效的替代品，则需要评估。
Cellulose diacetate(CDA) is not effective flame-retarded synergistic agent of IFR.
二乙酸纤维素不是IFR有效的阻燃协效剂。
Plasma is not effective in diminishing the trend of flow separation when it occurs.
出现流动分离趋势后，等离子体无法抑制分离趋势；
Fuzzy method has been used to detect edge, but it is not effective on complex scene image.
模糊技术早已应用于图像边缘检测，但是目前的方法对于复杂景物图像的边缘检测，效果不理想。
However, previous studies indicate that many digital libraries are still not effective for users.
然而，以往的研究表明，许多数字图书馆仍然不能有效地为用户服务。
Officials at the Food and Drug Administration said the drug was not effective enough to merit such risks.
食品药品管理局的官员说，此药的药效不足以来冒这种风险。
Under such circumstances, the Toronto researchers determined LSD was not effective in treating alcoholism.
在这种环境下，Toronto的研究者得出结论：LSD对酗酒的治疗无效。
The surgical mask is not as effective at trapping tiny particles and the paper mask is not effective at all.
外科口罩对于阻隔极小微粒并不十分有效，而纸制口罩根本无效。
The conservative treatment with brace in these patients is not effective and scoliosis is typically evolutive.
在这些患者中经保守治疗无效且脊柱侧弯畸形存在明显的进展。
Bortezomib alone or in combination with irinotecan was not effective in patients with relapsed or refractory CRC.
单用硼替佐米或联合伊立替康对复发或耐药的结直肠癌无效。
There may be times when self-help strategies are not effective in reducing the effects of exposure to traumatic stress.
有时，心理自助策略对缓解灾难事件产生的压力并不是很有效。
The comparison of cooperation measures shows that the simple reputation system is not effective to promote cooperation.
对两模型的合作指标比较表明，根据信誉调整策略的行为模式对促进合作无显著效果。
Although antibiotics can kill the anthrax bacteria, they are not effective in killing the toxins produced by the bacteria.
抗生素虽然可以杀死炭疽杆菌，但在消灭杆菌产生的毒素上，没有什么效果。
When hormonal therapy is not effective we now have chemotherapy regimens that have a good chance of controlling the disease.
当激素疗法不太见效的时候，还可以尝试化疗，也能很有效地控制疾病。
This is not to say that you can't define more granular protections using roles; you can, but frequently it is not effective to do so.
这并不是说无法使用角色定义更细粒度的保护，但这样做的效果通常不好。
In general, pointing out people's mistakes or criticizing their choices isn't polite, and it isn't welcome - and it's not effective!
总的来说，指出别人的错误或批评别人的选择是不礼貌的，也不受欢迎。那根本没有用！
The key point to remember is that the classpath specified in the EJB JAR file or the Web module is not effective until the deployment phase.
要记住的关键一点是EJBJAR文件或Web模块中指定的类路径在部署阶段之前是无效的。
Unless we identify anti-patterns, patterns and best practices of semantic interoperability, our decisions are not effective to solve problems.
除非我们确定了语义互操作性的反模式、模式和最佳实践，否则我们的决策就不能够有效地解决问题。
It is not effective to add a new static synchronized method in a subclass that attempts to protect static fields declared in a superclass.
通过在子类中增加一个静态同步方法来试图保护父类中的静态成员变量是无效的。
Permanent magnet synchronous motor is a multi-variable, non-linear and strong-coupling system, the traditional PID control is not effective.
永磁同步电机是一个多变量、非线性、强耦合的系统，传统PID速度控制效果不理想。
"In the last 20 minutes, they were dangerous every time we lost the ball and we were not effective enough up front. " On his team selection…
在最后二十分钟，每次我们丢掉球权他们看上去都非常危险，而我们的前场也不够有效率。
The conventional measures of anti-jamming are not effective, as a result of multiplicate jamming existing in the complex jamming environment.
由于复合干扰环境存在多种干扰方式，传统的抗干扰方法不是十分有效。
The conventional measures of anti-jamming are not effective, as a result of multiplicate jamming existing in the complex jamming environment.
由于复合干扰环境存在多种干扰方式，传统的抗干扰方法不是十分有效。
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