经济学
双山形梁
It will use so-called parabolic trough technology curved mirrors will concentrate sunlight and beam it at pipes full of fluid runing in front of the mirrors.
FORBES: Concentrating Solar Gets Government Boosts
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。