They have had effective control of the area since the security forces left.

自从安全部队离开后，他们实际控制了这一地区。

《柯林斯英汉双解大词典》

Such farming won't make the bay pristine again, but the researchers say the oysters are effective at cleaning the area where they're grown.

这样的养殖场还不能让切萨皮克湾完全回到以前的原生态，但是科学家表示，牡蛎在净化所生长区域海水上还是绝对有效的。

youdao

With the ability to manage business rules in a fast evolving environment, solution developers can develop more effective business applications in the enterprise content management area.

通过在快速变化环境中管理业务规则的功能，解决方案开发人员能够在企业内容管理领域开发更高效的业务应用。

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Our experiment also allows us to see which issue-area is most effective for each candidate.

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She said it had worked with FCC Environment to install extra wells which would extract gases from the area and would become effective within a couple of weeks.

BBC: Nottingham

Some military experts say you would need something like 50, 000 troops to really be effective in this area.

NPR: What the U.S. Can Do to End Violence in Darfur