Also, in surface water, there is a weak acid, carbonic acid, not sulfuric acid, but carbonic acid that helps dissolve the rock.

另外，在地表水中存在一种弱酸，它是碳酸，而不是硫酸，而且是能帮助溶解岩石的碳酸。

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Shareholders are, perhaps, too weak to be able to turn anger into outcome, but they may also be lazy, or complicit.

也许，股东们太软弱而无法把他们的愤怒转化为成果，不过也可能是太懒或串通好不做事。

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But you could also argue that the lack of middle class jobs is a result of weak growth.

但是，你也可以看到结果是中产阶级的工作需求疲软。

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The trouble with John Major was not just that he was too weak a personality to be an effective PM, but that he also made weak decisions - or did not make decisions at all.

BBC: How will history view John Major?

The country has run a deficit continuously for 30 years, but last year's was its biggest yet, driven not only by weak exports but also by rapid growth in consumer spending.

ECONOMIST: Are Australia's economic batteries running low?

Of course, each of these movies was poorly reviewed, and that may be the main factor in their poor performances, but the weak results also suggest that fantasy-free shoot-em-ups starring older men (many of them Expendables stars) aren't connecting with viewers right now.

CNN: STORY HIGHLIGHTS