藉新技术即能从废弃物中回收可用之物。 New techniques make it possible to recover usable things from waste.
安全曝光的时限价值或情况的范围,尤指曝光范围,在此期限内摄影用的底片能产生可用的影象 A range of values or conditions, especially the range of exposures over which a photographic film yields usable images.