Duba nassi da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar nassi: Passage: A lee trough, wanda aka fi sani da ƙuƙwalwar ƙuƙwalwa, shine "Ƙarfin matsin lamba wanda aka kafa a gefen dutsen dutse a cikin yanayi inda iska ke busawa tare da babban bangare a fadin dutsen dutse; sau da yawa ana gani a kan taswirar yanayi na Amurka a gabashin Dutsen Rocky, kuma wani lokacin gabas da Appalachians, inda ba a bayyana ba. "Ana iya kafa shi ko dai sakamakon matsewar adiabatic na nutsewar iska a gefen dutsen dutse, ko ta hanyar cyclogenesis wanda ya samo asali daga" haɗuwa ta kwance wanda ke haɗuwa da shimfiɗar ginshiƙan iska da ke wucewa a kan dutsen da saukowa gangaren lee. "Tambaya: Ta yaya za a iya samar da lee trough?
ko dai a sakamakon matsewar adiabatic na nutsewar iska a gefen dutsen dutse, ko ta hanyar cyclogenesis wanda ya haifar da "haɗin kai na kwance wanda ke haɗuwa da shimfidawa ta tsaye na ginshiƙan iska da ke wucewa a kan dutsen da kuma saukowa da dutsen dutsen