紫杉碱
This allowed superheated gases to get inside the orbiter's structure, causing it to tear apart as it made its descent towards Earth.
BBC: NEWS | Americas | Discovery docks after 'backflip'
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。