The fourth part has less slots, but it is not without it. For example, the humans and their scientists who have been educated by the aliens in the first three parts do not know that the body fluids of the aliens are super corrosive, even if the previous people are dead. But didn't even the biological traits of the aliens be studied when cultivating the aliens? Then I only put a layer of bulletproof glass in front of me, and the ground material is still metal. It's better if you put a layer of concrete, so I let the alien go away again, and gave the heroine who upgraded to a super female fighter a chance to perform!
As for the two recent prequel series, they have brought the performance of stupid humans to the extreme. They do not have the quality of scientific research expeditions. They were not killed by aliens, but by themselves. If I were a biochemical When people see that humans are so stupid, I will destroy them too!
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