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401, opaque a.不透明的;不传导的 The once clear mountain stream is now polluted and opaque. 曾经是很清澈的山溪, 现在受到污染变得混浊了。 难理解的, 晦涩的 The report was written in long, opaque sentences. 报告中的句子又长又难懂。 402, oppress vt.压迫,压制;压抑 vt. 使烦恼 Many troubles oppressed my father. 种种困难使我父亲意志消沉。 压迫, 压制 She is often oppressed by him. 她经常受他的压迫。 403, optimism n.乐观,乐观主义 Optimism made him alive through the hard days. 乐观主义使他在艰难的岁月里活了下来。 404, optimum n.最适条件,最适度 adj. 最适宜的; 最有利的 Do you know the optimum temperature for the growth of plants? 你知道庄稼生长的最佳温度吗? 405, option n.选择,取舍 You will have to pay them; you have no option. 你必须付给他们钱, 别无选择。 可选择的办法 The government has two options; to reduce spending or to increase taxes. 政府有两种选择的办法:或是减少开支, 或是增加税收。 | 
