The least said, the soonest mended.
(or Least said, soonest mended) 少说为佳。
Travellers on short trips to areas with water supplies of uncertain quality should avoid drinking tapwater, or untreated water from any other source.
短途旅行到水质不保险的地区时,应避免饮用水龙头的水或未经处理任何其他来源的水。