CREATE TABLE table_45721 ("Japanese" TEXT, "R\\u014dmaji" TEXT, "Meaning" TEXT, "Chinese" TEXT, "Romanization" TEXT, "Source language" TEXT)

What is the Romanization of the Mandarin word whose R maji is roncha
SELECT "Romanization" FROM table_45721 WHERE "Source language" = 'mandarin' AND "R\u014dmaji" = 'ūroncha'
SELECT "Romanization" FROM "table_45721" WHERE "R\u014dmaji" = 'ūroncha' AND "Source language" = 'mandarin'