Dr. Ludwig noted that the long-term effectiveness of fasting had not been well studied.

路德维希博士指出，禁食的长期有效性尚未经过充分的研究。

youdao

This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.

然而，这种方法在肿块较大时可能不是那么有效，并且其长期效果至今未知。

youdao

There is no doubt Gates' work is saving lives, but there are serious doubts about its long-term effectiveness.

毫无疑问，盖茨基金帮助了很多人，但它是否具有长久的生命力还是未知数。

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