定期换水 meaning in English
refreshing the water periodically
Examples
- To keep membranes in wet state , do not immerse them in stale water for long time . water should be changed periodically . avoid mildewing in summer and freezing in winter
部分作用膜储存时最好经清水浸泡膨胀、逐张晒干后保存、如湿态保存时不宜在死水中长期浸泡，应定期换水，夏秀防止发霉，冬秀防止冻裂。