在自由开口端，考虑了全部可能的出流及入流情况。
All possible flow patterns at the open end are considered.
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客户端已经推断出很多。
The client has to infer a lot here.
阴极射线管具有用以出射光线的光出射端。
The cathode ray tube has the light emitting end that is used to emit ray.
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