在微波双极型晶体管中，收集区的厚度是影响其截止频率的一个重要因素。

The thickness of collector is one of the factors that limit cut-off frequency in microwave bipolar transistors.

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这里同时也充当着点餐区和收集区，类似吧台的就餐空间设计非常适用于小群体客人。

As well as being an ordering and collection point, this counter also provides a bar-like dining space for small groups of customers.

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通过自1999年在罗平县水沟林场开始的杉木优树家系收集建设的实践，总结完善了杉木优树收集区的营建配套技术。

Through the practice of superior tree collection at Shuigou Forest Farm of Luoping county since 1999, a set of technology on establishment of superior tree collection site was summarized.

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