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1. However, “应用 few, little, no 等关键字以强调以往科学研究之不足” “科学研究主题风格”
Ex. However, no work has been done on (insufficient data are available on) surface-residue loss.
2. Although (While) “主题风格一的科学研究程度 much work has been done on X,” “主题风格二的科学研究程度 little information is available on Y”.
Ex. Although much research has been done on CO2 levels in agricultural soils (reference?),little work has been done on CO2 levels in forest soils.
3. “主题风格一的科学研究程度” but (yet to date)”主题风格二的科学研究程度”
Ex1. CO2 levels in agricultural soils have been studied extensively, but little attention has been devoted to CO2 levels in forest soils.
Ex2. Much research has been done on CO2 levels in agricultural soils, yet to date forest soils have been relatively neglected.
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