第一。 closing speed 這隻是這些列出的超光速運動之一。。 達到近2倍光速。。special relativity does not prohibit this。 closing speed 不是在給超光速的反例
第二。It tells us that it is wrong to use Galilean relativity to compute the velocity of one of the particles, as would be measured by an observer traveling alongside the other particle. That is, special relativity gives the right formula for computing such relative velocity.
給你簡單的翻譯一下。俠義相對論認為如果從與另一個粒子同行的觀察者角度測量，用伽利略相對性來計算其中一個粒子的速度，那是錯誤的。
這句是說 it tell us 中的it。是指special relativity。
as would be measured by an observer traveling alongside the other particle. 這句話給出了參照係。
That is, special relativity gives the right formula for computing such relative velocity. 狹義相對論對這樣的相對速度有正確的公式。。
