但也有人认为可能是出现了某个阶段的海洋酸化。
It is also thought to have seen a period of ocean acidification.
但也有人认为，鸟类是靠地球磁场导航的。
But others believe the birds are navigated by the earth's magnetic field.
说起……，很多人认为……，但也有人持不同观点……
When asked about … many people give their opinions that…but other people may see … differently .
但也有人认为这个问题有着深远的历史与文化根源。
Others say the problem has deep historical and cultural roots.
但也有人认为火球活动或许可以解释一些灯光。
There were also suggestions that fireball activity might explain some of the lights.
但也有人认为火球活动或许可以解释一些灯光。
There were also suggestions that fireball activity might explain some of the lights.
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