第一部分  英汉译
1、Old people in Widou Thiengoly say they can remember when there were so many trees that you couldn't see the sky2. Now, miles of reddish-brown sand surround this village in northwestern Senegal, dotted with occasional bushes and trees. Dried animal dung is scattered everywhere, but hardly any dried grass is.
    Overgrazing and climate change are the major causes of the Sahara's advance, said Gilles Boetsch, an anthropologist who directs a team of French scientists working with Senegalese researchers in the region. "The local Peul people are herders, often nomadic. But the pressure of the herds on the land has become too great," Mr. Boetsch said in an interview. "The vegetation ……此处隐藏8170个字…… as expanded, and continuous progress has been made in medical science and technology. As a result, people's health has improved remarkably.
    With the quickened pace of the country's industrialization and urbanization, as well as its increasingly aging population, the Chinese people are facing the dual health threats of infectious and chronic diseases, and the public needs better medical and health services. In the meantime, problems still exist regarding China's health resources, especially the shortage of high-quality resources and the unbalanced distribution of those resources. As such, China has arduous tasks ahead for reforming and developing its medical and health services.