常见例句The titania photocatalysts have been research quartern century. It has characteristic of photocatalysis which is excellent performance of environmetal cleanup. 二氧化鈦光觸媒已發展了25年，它具有光催化的特性，是一非常出色的環境清淨的光觸媒。quartern circle 四分圓 返回 quartern