例句與造句

1. With the development of science and technology , more and more oxide crystals are synthesized by more and more advanced technique , the new oxide crystals are incessantly synthesized and the new characters of oxide crystals are incessantly founded . corundum dopped with impurity not only is cherished because of it ' s beautiful appearance , but also is used in the fields such as electrotechnics , mechanism , laser , the optic apparatus and the underlay of semiconductor . sapphire dopped with ti3 + is the best material of the tunable solid laser . zno crystal is material of the direct gap semiconductor ( the width of forbidden band : 3 . 37ev ) . the excited emission in zno crystal at room temperature has been found , so the ultraviolet luminescence in zno semiconductor can be acquired at room temperature
   含有少量雜質(zhì)的剛玉晶體( - al _ 2o _ 3 )不僅由于其色澤艷麗成為人們珍愛的名貴寶石，而且由于它具有的優(yōu)異性能，被廣泛應用于電工、機械、激光器，光學器件和半導體襯底材料。鈦藍寶石是目前最優(yōu)異的固體寬帶調(diào)諧激光材料，用于制作飛秒脈沖可調(diào)諧激光器。氧化鋅晶體是直接帶隙寬禁帶半導體材料(禁帶寬度3 . 37ev ) ，現(xiàn)已發(fā)現(xiàn)具有室溫下受激發(fā)射特性，有可能實現(xiàn)室溫下半導體紫外發(fā)光。
2. It's difficult to find direct gap semiconductor in a sentence. 用direct gap semiconductor造句挺難的