At the beginning of the 1990s, Puerto Rico started to develop its first modern urban rail transit system (the Tren Urbano program).
波多黎各于20世纪90年代初才开始发展城市轨道交通,但因为善于利用后发优势,通过产学研的结合,充分考虑了地铁工程的多学科特性,走出一条有波多黎各特色的道路,成为美国和国际公共交通领域技术交流的典范。
Potlatch and the Loss of Traditional Totem Pole Culture——Symbolic Meanings of Totem Pole Culture of Canadian Indians;
波多拉支的兴衰与图腾柱文化传统的失落——加拿大印第安人图腾柱文化象征阐释
With the deepening of oilfield E&P,the multi-wave and multi-component seismic data have been found wider and wider applications.
随着油田勘探开发的不断深入,多波多分量地震资料的应用也越来越广泛。
In the engineering seismic prospecting, its objects will include not only general layer form but also inhomogeneous complicated media under more circumstances, the usual methods of geometry seismology can hardly resolve this problem, so people must adopt multi-wave and multi-component seismic prospecting.
工程地震勘探中,其勘探对象除了一般层状地质构造外,更多情况下会遇到非均匀复杂构造体,以往的几何地震学方法很难解决这类问题,因此必须采用多波多分量地震勘探。