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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It's still a work in progress - and a bit of a disappointment if you took Mrs Gillan's answer to Jonathan Edwards at face value.

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"We've been looking at various ways to boost the estate's income which would allow us to reduce the subsidy such as putting up marquees for weddings, but it's still a work in progress, " he said.

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It's still a work in progress.

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