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There is continuing debate as to how effective sunscreen is in reducing melanomas—the evidence is weaker than it is for preventing other types of skin cancer.

关于防晒霜是否能有效减少黑色素瘤，争议仍然存在——相较于预防其他皮肤癌，防晒霜能减少黑色素瘤的证据还不充分。

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The article raised doubts about how effective the new drug really was.

这篇文章对这种新药的实效有多大提出了疑问。

《牛津词典》

A team from Massachusetts General Hospital and Sweden's Lund University studied how effective the biomarkers are as predictors.

VOA: special.2009.07.15

But what's important is not where that most probable radius is when we're talking about the z effective it feels, what's more important is how close the electron actually can get the nucleus.

但重要的不是,最可能半径,当我们谈论它感到的有效电荷量的时候，更重要的是,电子实际上。

麻省理工公开课 - 化学原理课程节选

The first is this the z effective, or how much charge is actually in the nucleus that's felt, Z or the I guess we would say the z, how much the charge is on the nucleus that holds it close together.

第一个是有效核电量，或者说实际感受到的核电荷量，又或者我想我可以说就是，使它们保持在一起的,原子核的电荷量。

麻省理工公开课 - 化学原理课程节选

Just how effective advertising is to the current multitasking generation of fans is open to debate anyway.

FORBES: The NBA Spreads Its Digital Wings

"This gives us a chance to see how effective the new standards are, " he told CNN.

CNN: 9 still hospitalized after Connecticut train collision

The questions are ranked in order of how effective they are at sorting people.

NEWYORKER: Looking for Someone