在正确路线的指引下，我们成功地设计和试制了一种新型长焦距大型照相机。
Correct under the guiding of route we successfully design and have trial-produced the one kind of new long large-scale camera of focal distance.
在正确路线的指引下，我们成功地设计和试制了一种新型长焦距大型照相机。
Correct under the guiding of route we successfully design and have trial-produced the one kind of new long large-scale camera of focal distance.
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