And people who are giving have endured this very difficult 12 month period and so giving is down,"

VOA: standard.2009.12.16

And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.

科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战

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This is very difficult because there are no high ladders and pressures from day-to-day work you get very much in the way of learning.

这很困难,因为学习不能一步登天,而巨大的工作压力,还存在于学习的每一天。

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"We are on the side of working families and businesses and this will fuel our recovery at this very difficult economic time for the world", Mr Osborne said.

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The cast members acted out the very worst reactions to this very difficult news.

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"Our thoughts are with the family, friends and colleagues at this very difficult time, " they added.

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