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。

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But we also know that these tools are insufficient to defeat malaria in its heartland and eventually interrupt transmission.

但我们也懂得，要在疟疾的中心地带战胜它并最终阻断传播，这些工具还不够。

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But that is still insufficient, and there are also fears about the quality of jobs being created.

但这仍然是不够的，同时，还有一些对于就业质量的担忧。

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But Reid argued that insufficient hearings had been held in the Senate on the subject, and he also cited the press of other Senate business that must be completed before Congress adjourns for the year.

CNN: Democrat blocks Senate debate of cloning ban