英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
upstrokes查看　upstrokes　在百度字典中的解释百度英翻中〔查看〕
upstrokes查看　upstrokes　在Google字典中的解释Google英翻中〔查看〕
upstrokes查看　upstrokes　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Half of Species That Migrate Are in Decline, UN Says
    The first-ever State of the World’s Migratory Species report was launched today by the Convention on the Conservation of Migratory Species of Wild Animals (CMS), a UN biodiversity treaty, at the opening of a major UN wildlife conservation conference
  • Educator Vertebrate Declines - BioInteractive
    mammals), whereas the bottom panels represent only bird species BACKGROUND INFORMATION Extinctions are a regular occurrence over the course of geologic time But catastrophic events in which many species go extinct over brief periods of time are rare When our planet loses more than 70% of its species within a
  • 28 Facts About Biodiversity - TRVST
    The Earth is home to different species and communities of species Biodiversity is unique in all parts of the Earth As the environmental conditions change from what millions of species adapted to, many are under the threat of extinction Every species is valuable and in need of protection These 26 biodiversity facts point out interesting aspects of our Earth’s biosystem alongside the
  • Archeology and the Anthropocene - ScienceDirect
    In a landmark paper published in the journal Science near the turn of the 21st century, “Human Domination of Earth's Ecosystems,” Vitousek et al (1997) conducted a meta-analysis and found that humans had reached a historical watershed in transforming our planet—atmospherically, hydrologically, pedologically, geochemically, biologically, ecologically, and more (Fig 1)
  • How many species are there on Earth? Progress and problems
    In spite of 250 years of taxonomic classification and over 1 2 million species already catalogued in a central database, our results suggest that some 86% of existing species on Earth and 91% of
  • Accelerated modern human–induced species losses . . . - Science
    The loss of biodiversity is one of the most critical current environmental problems, threatening valuable ecosystem services and human well-being (1–7) A growing body of evidence indicates that current species extinction rates are higher than the pre-human background rate (8–15), with hundreds of anthropogenic vertebrate extinctions documented in prehistoric and historic times (16–23)
  • The Top 5 Threats to Bird Populations - Science of Birds
    There are about 10,000 bird species in the world Some authorities put the number at more like 11,000 In any case, the number is in that ballpark, and this means birds are an incredibly diverse group of animals But current research tells us that worldwide 40% of these species are in decline The populations of almost 4,000 bird species are





中文字典-英文字典  2005-2009