生物学
小断片
When his series of 15 five-minute exposures is done, he has a truly startling image: a fragment of a supernova, a star that exploded 25, 000 years ago.
FORBES: A Star Is Born
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。