We are all part of one big family.
part of sth.是“某物的一部分”，这个“部分”可大可小，可能超过一半，也可能不到一半或仅占一份，但part必须用单数，不可加-s，part前也不可加a，a part of sth.是“某物的一小部分”，只占“一半以下”，但part都不可加-s。
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