But when faced with learning.

但是当面对学习时。

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Everyone has his time of fear, but when faced with it, we should stay calm and try to overcome it.

每个人都有害怕的时候，但在面临恐惧时，我们应该保持冷静的头脑，克服恐惧。

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But when faced with a complex task, framing the challenge in the right way can really help to focus people's efforts.

但是，在面对复杂的任务时，以适当方式对难题进行拆分确实有助于明确工作重点。

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By mimicking the conditions created by melanomas, they showed that in the presence of tumour cells, the immune system sent out IgG4 antibodies, but when faced with healthy cells it functioned as expected with IgG1 circulating.

BBC: Skin cancer 'able to fight off body's immune system'

But neither argument is compelling when faced with the reality of an out-of-control deficit.

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Supporters say that the country always seems to shuffle its feet but then snaps into action when faced with a crisis.

ECONOMIST: Japan as number three