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In the 17th century, the French scientist Pierre Gassendi knew that light traveled faster than sound. When a gun fired far away, he could see the flash of gunshot long before he heard the report. Gassendi tried to measure the speed of sound by clocki
High Olympics Price Tag Draws Controversy Grand preparations The stadiums and arenas of the Olympic Park are impressive, and the Olympics will no doubt be a grand show. But concerns about the cost linger. Former British Olympic gold medalist and memb
Lesson 161 It's too stort. 1.It's too short.这太短了。 2.It's a short holiday.这个假期真短。 3.It's a short distance to school.这里到学校距离很近。 4.Are you short of money?你缺钱用吗? 5.We are short of hands.我们缺少人
The Habitable Zone 宇宙生命奥秘 适居带(HZ)是天文学上给一种空间的名称,指的是那里的情况有利于生物的存在,或许可以发现像地球这样的生命体。有两种区域是有可能的,一个是在行星系内,
Parallax 视差就是从有一定距离的两个点上观察同一个目标所产生的方向差异。从目标看两个点之间的夹角,叫做这两个点的视差,两点之间的距离称作基线。只要知道视差角度和基线长度,就