These steps may slow the flow of oil into the sea, perhaps substantially, but they will not stop it altogether, and carry a slight risk of increasing it.

这些步骤也许会大大减缓石油流进海中的速度，但是不能完全遏止，甚至还有一丝加速泄漏的危险。

youdao

But it also improved their school grades substantially, although this is not what they were paid for.

但是这同时大大提高了他们的学习成绩，尽管他们并不会因此得到奖励。

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Use of all seven techniques is not mandatory, but doing so can substantially reduce the chance that relevant candidate services have been missed.

我们并不一定需要使用所有7种技术，但是这样做可以大幅降低漏掉相关候选服务的概率。

youdao

U.S.unemployment jumped a half percent in May, to 9.4 percent prompting this comment by Austan Goolsbee, a member of President Barack Obama's Council of Economic Advisors: "The economy clearly has gotten substantially worse from the initial predictions that were being made, not just by the White House, but by all of the private sector,"

VOA: standard.2009.06.07

That has raised the level of tension to some extent, but I think not substantially.

NPR: The Nuclear Debate from Iran's Viewpoint

That depends on the likelihood of substantially similar (but not identical) index funds or ETFs getting around the IRS wash sale rules.

FORBES: A Magical Tax-Loss Harvesting Machine?

But it could become one if deficits do not fall substantially in the medium term, beyond a mere reflection of a cyclical improvement in the economy.

ECONOMIST: Financial markets