n.骑马哨兵，小型哨艇
Where can I buy vidicon shield?
在哪里能买到摄像机护罩?
Add a vidicon around the factory.
厂区外围增加一个摄像机.
Vidicon was developed in the 1950's.
视像管是在二十世纪五十年代发明的.
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