求翻译：The apes arrive on Earth in 1973, splashing down on the Pacific coast. They are transported to a secluded area of the Los Angeles Zoo, under the observation of two scientists, Stephanie Branton (Natalie Trundy) and Lewis Dixon (Bradford Dillman). The apes' power of speech is revealed when Zira's impatience gets the better of her during an experiment. Soon after this, Milo is killed by a gorilla who becomes agitated by an argument amongst the three chimpanzees.是什么意思？

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