In addition, evidence of long term effectiveness is lacking and cost-effectiveness is uncertain.

此外，缺乏长期效益与成本效益的证据。

youdao

We remain skeptical about the long term effectiveness of unilateral JPY intervention as previous efforts have had only a short-lived impact.

因为前几次努力都只是产生昙花一现的效果，所以我们仍怀疑单边干预日元的长期效果。

youdao

Neither piece of research is the last word, and neither discounts the long-term effectiveness of economic growth in improving working conditions.

这两篇研究报告都不是定论，而且都没有考虑经济增长对改善工作环境的长期效果。

youdao

But Dr.Martin says the long-term effectiveness of certain heart catheterization procedures is unclear.

VOA: standard.2010.01.01

While their long-term effectiveness is unclear, Yun and Lee believe these also will spur the body's trauma response.

FORBES: Rethinking Biology

It is still too early to judge the long-term effectiveness of Dayton.

CNN: Giving Peace a Chance

They plan an additional 18-month study, starting next year, to explore the drug's long-term effectiveness and safety, as well as risk behavior and pill-taking practices.

WSJ: Daily Pill Slashes Risk of HIV Infection in Study