NASA的Cooke还说，与观测其他流星雨相比，享受这次自然景观不需要任何奇奇怪怪的光学仪器。
AS with any meteor shower, there's no need for fancy optical equipment to enjoy the show, NASA's Cooke added.
请利用一个激光笔发明并制造一个做的光学仪器，使其可以不接触地测量一个玻璃片的厚度、折射率以及其他属性。
Invent and construct an optical device that USES a laser pointer and allows contactless determination of thickness, refractive index, and other properties of a glass sheet.
请利用一个激光笔发明并制造一个做的光学仪器，使其可以不接触地测量一个玻璃片的厚度、折射率以及其他属性。
Invent and construct an optical device that USES a laser pointer and allows contactless determination of thickness, refractive index, and other properties of a glass sheet.
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