... (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。
It might seem superfluous to say that the large majority of stars maintain their properties unchanged for great lengths of time.
绝大多数恒星在很长时间内保持其性质不变，这一点看来已经没有什么疑问了。
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