Butter, margarine, and oily fish are all good sources of vitamin D.黄油、人造黄油和多脂鱼都含有丰富的维生素D。A pall of oily black smoke drifted over the cliff-top.一团油腻的黑色烟雾飘到悬崖顶上。He was wiping his hands on an oily rag.他正在用一块满是油污的破布擦手。...
Anyone will help you when you meet with difficulties.你有困难时谁都会帮助你.Finally he overcame the auditory difficulties by three years' efforts.通过三年的努力, 他最终克服了听觉中的困难。It is difficulties that show what men are.----Epictetus困难方...