quartern

常見例句

• 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(fā)展了25年，它具有光催化的特性，是一非常出色的環(huán)境清凈的光觸媒。
• quartern circle
  四分圓
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