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to phrases
step index
adv. 打索引; 打梯级
oil 步长指数
space 阶跃折射率
telecom. 突变折射率
step-index
el. 阶跃折射率
step index: 28 phrases in 8 subjects
Agriculture1
Electronics11
Information technology4
Oil / petroleum1
Space2
Technology5
Telecommunications3
Textile industry1

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