JavaWeb:報錯信息The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

JavaWeb: 報錯信息The superclass 「javax.servlet.http.HttpServlet」 was not found on the Java Build Path 再導入外部的web項目之後報錯: The superclass 「javax.servlet.http.HttpServlet」 was not found on the Java Build Path。
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