unaccessible造句

• The optical parametric oscillator ( opo ) has been widely used as a wavelength tunable coherent radiation source, since it offers a broad tuning range from ultraviolet to far infrared, and some of its wavelengths are unaccessible to common laser systems, so opo has great value of application
  光学参量振荡器具有可调谐的优点，调谐范围可从紫外到远红外以上，弥补了普通的激光器只能输出一种波长激光的缺点，并且覆盖了普通激光器不能达到的波长，具有很高的应用价值。