Using sustainable harvesting norms, only 30% of the allocated forest area is used for silkworm harvesting and then is left alone for three years.

根据可持续性生产标准，在指定林区内只有30%的林木用于野蚕生产，它们在生产之后修养三年。

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His skin was burnt nearly black by the sun and his clothes were made from pieces of a ship's sail. 'Poor Ben Gunn,' he went on. 'Alone for three years.

他的皮肤被晒黑了，衣服是船帆的破布条。“我是可怜的本·葛恩，”他继续说，“我一个人在这儿三年了。”

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Even now, three years later, they still refuse to apologize to the children and I for the fact that Lisa died alone.

可是哪怕是三年后的今天，医院始终拒绝因为Lisa孤独地离去向我和孩子们道歉。

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Labour's Lord Barnett, who invented the Barnett formula when he was Chief Secretary to the Treasury in the 1970s, said he had not expected the mechanism to last for three years let alone 30.

BBC: Lord Barnett demands end to Scotland funding formula

The cost of discounted, long-distance calls in America has plunged by more than half during the past three years alone, while the tariffs for international calls have tumbled by two-thirds.

ECONOMIST: WorldCom tucks in��again

If Ford can sell on average more than 70, 000 cars a month in China next year, something which looks very likely given the fact that it will introduce 15 new models in the next three years, the country alone will account for about 15% of its global sales.

FORBES: Japanese Auto Sales In China Improve But No Match For GM And Ford