quartern造句

例句与造句

1. The titania photocatalysts have been research quartern century . it has characteristic of photocatalysis which is excellent performance of environmetal cleanup
   二氧化钛光触媒已发展了25年，它具有光催化的特性，是一非常出色的环境清净的光触媒。
2. It's difficult to find quartern in a sentence. 用quartern造句挺难的