At least one of every two 15-year-old boys in Kenya, South Africa, Zimbabwe and Botswana is on track to die of AIDS.是什么意思_At least one of every two 15-year-old boys in Kenya, South Africa, Zimbabwe and Botswana is on track to die of AIDS.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句