This potential limitation may offer solace to those who do not want to address the ethical dilemmas of human cloning. 这种潜在的局限性也许对于那些不想应付克隆人类自身带来的种种伦理难题的人是个极大的安慰。
Water is essential for human being, economic activities, and important environmental resources as well. 水资源是人类生存和社会经济发展的重要物质基础，也是重要的环境资源，水危机已严重影响人们生活，损害人类健康，阻碍经济发展，危及人类自身生存与发展。
