It will gradually catch up with this slow pulse, reducing the speed of light in the slow pulse's vicinity.
它会逐渐赶上这个更慢的脉冲，降低整个慢脉冲附近光的速度。
As this third pulse approaches the tail of the second one it will also slow down (because the speed of light in the glass it is passing through has been reduced by the second pulse's passage).
随着第三个脉冲接触到第二个脉冲的尾部，它的速度也同样被减慢(因为其穿越的玻璃中的光速已经被第二个脉冲的穿越而减慢)。
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