例句與造句

1. The theory research on the location of a frequency doubling crystal in a double - pass intracavity frequency doubling laser
   雙程腔內(nèi)倍頻激光器的諧波晶體腔內(nèi)位置的理論研究
2. It's difficult to find frequency double laser in a sentence. 用frequency double laser造句挺難的