两次曝光;
It was taken with a Polaroid camera, meaning double exposure is very unlikely.
这是用宝丽来相机拍摄的,这就意味着不可能是双重曝光后的照片。
An experimental double-beam and double-exposure interference photolithographic system has been established.
建立了双光束双曝光干涉光刻实验系统.
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