恒星时间的小时
If it misses this window, further opportunities occur at intervals of 23 hours and 56 minutes a period known as a sidereal day.
ECONOMIST: A new satellite will test Einstein's magnum opus
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。