Mariann was very conscientious and responsible, and spoke Mandarin with a thick Shandong accent. Her Chinese was so fluent, and her pronunciation of retroflex sounds (with the tip of the tongue curled up) so genuine, that she put us "Taiwanese Mandarin" speakers to shame.
李小姐做事認真負責，尤其，一口濃厚山東腔的北京話，捲舌地道、不打折扣，標準流利得令我們這一幫子說台灣國語的同胞汗顏。