单词：methylophippogonone
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How do you like a behind-the-scenes look at one of the nature's most luxurious full service, hippos' spas. Our dominant male hippo customer has already arrived here at the Mezima Spring in Kenya, Africa. The carp goes right to work. It uses its wide,
自然百科2008年
How do you like a behind-the-scenes look at one of the nature's most luxurious full service, hippos' spas. Our dominant male hippo customer has already arrived here at the Mezima Spring in Kenya, Africa. The carp goes right to work. It uses its wide
国家地理2008年
The Hippo and I 我与河马 A hippo lives in the zoo. I like him very much. I often go to see him. He often thinks of me, too. Today is Sunday. It is a fine day. I go to see him again. After I leave the zoo, he follows me to my house. I give him let
X星球系列故事
This is Scientific Americans 60-Second Science. Im Cynthia Graber. This will just take a minute. Saliva contains many useful components: lubricants, enzymes for breaking down food and now compounds that can reveal a persons age. Thats according to a
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AGRICULTURE REPORT - Restrictions on Methyl Bromide By Mario Ritter Broadcast: Tuesday, March 16, 2004 This is Steve Ember with the VOA Special English Agriculture Report. Graphic Image Some chemicals
农业与发展
Science and Technology Epigenetics and stress Baby blues 科技 外因遗传与压力 新生儿蓝调曲 A mother's stress while she is pregnant can have a long-lasting effect on her children's genes 母亲孕期压力过大会对孩子的基因造成长
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