声音和图象同步；摄影机前同时举起的挡板。
Synchronizes sound and picture; boards held in front of a movie camera are banged together.
运输前拧紧所有密封件，盖好阀门挡板。
Tight all closures and put the valve cover door on position before shipment.
运输前拧紧所有密封件，盖好阀门挡板。
Tight all closures and put the valve cover door on position before shipment.
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