Concentrators in geological sciences elect either geology or geography.

主修地质学的学生要选修地质学或地理课程.

《简明英汉词典》

Parabolic dish concentrators are similar to trough concentrators, but focus the sunlight on a single point.

抛物线碟形聚光器类似于抛物线槽型聚光器, 但将光聚焦于单一点上.

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DTR standard defines requirements for newndstations and concentrators , and It'specifies a protocol for full - duplex operation.

此DTR标准定义了新的端站与集中器的要求并制定了全双工工作的协议.

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