One may use a polycrystalline sample rather than a single crystal for many studies. 我們可以用一種多晶樣品代替單晶進(jìn)行多方面的研究。
Development of such distributed feedback heterostructure lasers requires crystal growth on corrugated layers. 研制這種分布反饋雙異質(zhì)結構激光器要求在皺折層上生長(cháng)出單晶層。
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