单词：aspidospermatine
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RACHEL MARTIN, HOST: A wide-ranging study shows that sperm counts are plummeting throughout the Western world, and scientists don't know why. NPR health correspondent Rob Stein suggests some of the potential reasons. ROB STEIN, BYLINE: In Margaret At
2017年NPR美国国家公共电台7月
A: Were you able to get a look at the suspect's face? B: Yes. I know exactly what he looks like. A: I must ask you to pick him out of a line-up. B: That won't be a problem. A: Look closely at the five men in this line-up. B: I am looking. A: Do you s
英语情景对话-犯罪
A: Did you get a good look at the suspect? B: I got a great look at him. A: Do you think you could pick him out of a line-up? B: I can do that. A: Could you please look at the five men in this line-up? B: All right. A: Do you recognize the suspect? B
英语情景对话-犯罪
A: Could I pay for my parking ticket? B: I need to see your ticket. Do you have it? A: Here's my ticket right here. B: I'm going to need to see your ID. A: I don't have it. B: You can't pay your fine without your ID. A: I don't understand why I can't
英语情景对话-驾驶
Beijing, Sept. 6 (Xinhua) -- A sperm donation scandal disclosed recently has aroused growing concern in the United States. According to the New York Times' report, Ryan Kramer, the son of a donor, found that he has more than 150 half-siblings - they
英语新闻
WASHINGTON, Aug. 4 (Xinhua) -- Researchers have found a way to turn mouse embryonic stem cells into sperm and this finding opens up new avenues for infertility research and treatment, according to astudy published Thursday in the online edition of jo
英语新闻