"It looked like a cool optical material," he said.
“它看上去就像是某种很酷的光学材料，”他说。
Self focusing rod is a kind of new optical material.
自聚焦棒是一种新型的光学材料。
This crystal was a new promising nonlinear optical material.
该晶体是一种很有前途的非线性光学材料。
This crystal was a new promising nonlinear optical material.
该晶体是一种很有前途的非线性光学材料。
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