... (3)+(2a)增加/减少：名词 keep / remain / maintain unchanged / constant / stable（保持不变） fluctuate upward / downward（波动向上/向下） ...
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The present invention can maintain unchanged playing period after regulating tone.
本发明在调整音调后可保持原播放时间不变。
Therefore, if the structure of landscape patterns maintain unchanged, the trend of stream runoff and precipitation will be the same.
在泾河流域，若维持 景观 结构的稳定，则径流的变化趋势会与降雨的变化趋势保持一致。
In available technology, there is no valve with controlled opening based on the density of liquid to maintain unchanged liquid density.
现有技术中的阀门不能根据液体的密度变化控制阀的开启状况，从而保持液体的密度不变。
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