opportunities and challenges for China and the United States 可再生能源发电：中美两国面临的机遇和挑战：opportunities and challenges for China and the United States opportunities and challenges for Latin America and the Caribbean / opportunities and challenges for frontline practice opportunities and challenges in central and eastern europe opportunities and challenges in financial innovations opportunities and challenges for women in science and technology Opportunities and challenges that the internet of things creates opportunities and challenges for a new globalization / Opportunities and challenges that the internet of things crestes