The subjects were all junior high school students in Taipei City.By using the probability proportionate to size sampling method, 1438 of valid samples were collected.是什么意思_The subjects were all junior high school students in Taipei City.By using the probability proportionate to size sampling method, 1438 of valid samples were collected.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句