以下为句子列表：
英文: They pointed out that modulation wave fronts (such as those in the front of a light pulse) in a negative index material are aligned the same way as they are in a positive index material—anything else would violate basic causality and require parts of the
中文: 他们指出在负折射率材料中调制波前（例如光脉冲前端的波前）的方向，与在正折射率材料中相同；若非如此，就会违反基本因果律，且部份波的前进速度将成为无限大。
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