Improvement of reproductive efficiency takes important role in increase of economic benefit of goat production.
为了提高肉羊生产经济效益，提高波尔羊繁殖效率具有重要意义。
Practice proved that only strengthening management of coal quality could increase economic benefit.
实践证明，只有强化煤质管理才能提高经济效益。
Practice proved that only strengthening management of coal quality could increase economic benefit.
实践证明，只有强化煤质管理才能提高经济效益。
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