定期换水的英文

refreshing the water periodically

• 定期:    fix a date regular ...
• 换:    exchange; barter; ...
• 水:    water

例句与用法

1. 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。