单词：nature-printed
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SCOTT SIMON, HOST: Three-D printers are being used these days to make all kinds of things - jewelry, artwork, or even guns. Now, scientists have used a 3-D printer to create a functioning mouse ovary. Yes. NPR's Rob Stein explains. ROB STEIN, BYLINE:
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Unit 5 memorandum Conversation 1 第五单元 备忘录 会话 1 A:Can you tell me the differences between a letter and a memorandum ,Miss Zhong? A:你能告诉我信函和便函有什么区别吗，钟小姐？ B:Certainly.A letter must be sent out
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