<prompt> Translate the following text to EnglishJumba kubwa la kifalme lililojengwa huko Osaka lilikuwa kubwa zaidi kuliko yote ambayo Japani imewahi kuona, na lilihitaji wafanyakazi 30,000 wa kuijenga.  <response>: The gigantic castle he erected at Osaka was the biggest Japan had ever seen, requiring a work force of 30,000 men. 