Beijing is a 65-square-mile expanse of flatland surrounded by a desert that is fast encroaching because of massive defor北京是一大片占地65平方哩的平地，周遭被沙漠包围，并因大量滥伐正快速侵蚀。
Forty-five years f expericence in design ,inspection,consultation and supervision of Large-scale and medium culverts ,sl四十五年从事平原地区大中型涵、闸、桥、南和船闸工程和农田水落石出利规划设计、审查、咨询、监理工作。