pH-1%EC%97%90%EA%B2%8C+%26%238216%3B%EB%AC%B4%EB%A6%AC%EC%95%BC%26%238217%3B+%EB%9D%BC%EC%9D%B4%EB%B8%8C%EB%A5%BC+%EC%9A%94%EC%B2%AD%ED%96%88%EB%8B%A4.+%EA%B7%B8%EB%9F%B0%EB%8D%B0+%EB%B0%A9%ED%95%B4%EA%BE%BC%EC%9D%B4%26%238230%3B.