He tore open the envelope and at first thought it was empty. Then he noticed a single white feather had fallen from it.
他撕开信封，最初还以为里面空无一物，随后才发现有一根从信封中飘落的洁白羽毛。
The "Bachelor Day" has been initiated by single college students and, although enjoys no holiday leave, has become a vogue of the day among single white collars.
“光棍节”兴起于单身的大学生们，尽管这天不放假，这天仍旧成为单身白领圈的时尚节日。
The result is that single white rat growing in complicated environment possesses better memorial and learning ability than that growing in simple environment.
结果表明：丰富环境下成长的个体，其学习记忆能力好于单调环境下成长的个体。
Single white/ vivid purple-red patches.
单瓣花，白色底镶上紫红色斑块。
Single white/ vivid purple-red patches.
单瓣花，白色底镶上紫红色斑块。
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