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trough The bottom between two waves.
Ãâó: www.paddling.net/guidelines/showArticle.html
trough the lowest point of a wave.
Ãâó: www.baylink.org/fieldtrips/glossary.html
trough (Thalwet) An elongated area of relatively low atmospheric pressure.
Ãâó: www.palmbeachdailynews.com/weather/content/shared/...
trough Structures over the filter bed either for distributing settled water in the filter or to receive backwash wastewater for discharging to the gutter.
Ãâó: www.who.int/docstore/water_sanitation_health/watre...
trough Space between wave crests and the water surface below it.
Ãâó: www.ieca.org/Resources/Reference/DefinitionsTZ.asp
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