Work has begun to determine the feasibility of using insects as biological controls, but effective biological controls are considered years away.
人们已经开始努力确定使用昆虫作为生物控制手段的可行性，但仍认为有效的生物控制手段还需要数年时间。
Food companies have been trying to make effective satiety-inducing foods for years, but with little success.
食品公司研发能够有效诱导饱腹感的食物已经有数年了，但没有任何进展。
"We've been working on this problem for over 10 years and the vaccines we've tried in the past have induced some immune responses but they have not been very effective."
我们已经研究这个问题超过10年了，之前的一些疫苗能够引发一定的免疫反应，但是并不足够有效。
The researchers also found insufficient evidence to support the use of ADHD medications in children younger than 6 years of age, but two drugs are generally safe and effective for older children.
研究人员还发现，对低于6岁儿童施用多动症药物的证据还不太充足，但两种药物对年龄稍大的儿童是安全而有效的。
The cops' methods are sometimes crude—police stops in New York have increased five-fold in the past five years—but highly effective.
使用的方式有时候也很原始——纽约警察岗亭的数量在过去5年翻了5番——但确实很有效。
But it would take a telescope with the effective diameter of the sun to actually take photographs of something the size of an elephant strolling on an exoplanet only 4.3 light-years away.
但是，假设距离我们仅有4.3光年远的一颗系外行星上，有一头徜徉漫步的大象，我们如果要拍到它，也得使用一个直径有太阳那么大的望远镜。
She decided to undergo electrolysis after reading a magazine article about it, but her GP told her she would have to wait until two years after puberty if she wanted it to be effective.
当她在一篇杂志上读到一篇关于电蚀除瘤的的文章时她决定尝试。但是她的的医生告诉他如果她想要电蚀除瘤有效果的话，她必须等到青春期发育两年后治疗才行。
'we've been working on this problem for over 10 years and the vaccines we've tried in the past have induced some immune responses but they have not been very effective.
我们已经研究这个问题超过10年了，之前的一些疫苗能够引发一定的免疫反应，但是并不足够有效。
The card is effective for a lifetime, but the account will be cancelled if membership has no consumption in two years.
本店会员卡终身有效，但如果会员连续两年未在本店产生任何消费，本店系统将自动取消会员账号。
SUMMARY OF BACKGROUND data: Surgery for spinal stenosis has been shown to be more effective compared to nonoperative treatment over 2 years, but longer-term data have not been analyzed.
数据背景摘要：手术治疗腰椎管狭窄已证实在超过2年随访中疗效要优于非手术治疗，但还没有长期的临床数据证实。
The researches about it have been more than 200 years, many hypotheses about its mechanism have been put forward, but so far not clearly, nor do precise and effective control methods.
关于近视的研究历史已有200余年，就近视的发生机制人们也曾提出许多假说，但至今尚不能明确，更没有确切有效的防治方法。
You may spend years learning knowledge related to your work but have little ideas for effective presentation.
您可能会花上好几年时间学习跟工作相关的专门技术知识，但对于有效的沟通演讲却毫无概念。
Saturn has a reputation of being stern, which is true, but he is an effective teacher, and what you learn will stay with you for years, possibly for life.
土星的确以严厉著称，但同时，它是一个高效的老师，你从它哪里学到的将会让你受益很长时间，也可能是整个生命。
Recently years, this method does not only display important effects in the field of engineering and environment, but also becomes reliant and effective means in the detection of coal mine and tunnel.
近年来，该方法不仅在工程与环境物探领域发挥着重要作用，也成为煤矿、隧道勘查可以信赖的有效手段。
No Merry Andrew, to stir up the multitude with jests, perhaps hundreds of years old, but still effective, by their appeals to the very broadest sources of mirthful sympathy.
“也没有逗得大家哄堂大笑的”快乐的安德鲁“说那些由于笑料选出、虽已流传上百年、仍让人百听不厌的笑话。”
No Merry Andrew, to stir up the multitude with jests, perhaps hundreds of years old, but still effective, by their appeals to the very broadest sources of mirthful sympathy.
“也没有逗得大家哄堂大笑的”快乐的安德鲁“说那些由于笑料选出、虽已流传上百年、仍让人百听不厌的笑话。”
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