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These shapes have proved to be the most effective in preventing a surface from misting over.

现已经证明这些形状在防止表面起雾上最为有效。

youdao

Routine cleaning and disinfection of horse stables is expected to be effective in preventing infection.

常规清洁马厩并进行消毒预计可有效预防感染。

youdao

Some medicines are generally effective in preventing and treating malaria.

VOA: special.2009.05.26

So far it has proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.07

The vaccine has already proven effective at preventing the disease in half of those vaccinated which is more than ever before.

VOA: special.2009.12.22

The target here, Lipitor, not only reduces bad cholesterol but also is effective in preventing strokes.

FORBES: Magazine Article

Access to clean water and good hygiene practices are extremely effective in preventing childhood diarrhoea.

BBC: Move to cut child diarrhoea death

But have they been effective in preventing those most vulnerable from becoming gambling addicts?

BBC: NEWS | Programmes | Documentary Archive | Place Your Bets