Ndi mitundu yanji ya nsalu za sweti?
Tsopano nyengo yozizira, sweti yokhala ndi kutentha kwakukulu idzakhala yotchuka posachedwa m'nyengo yozizira, ndithudi, mitundu yosiyanasiyana ya sweti imakhalanso yochuluka kwambiri, zomwe zimapangitsa kuti ogwirizana nawo pogula sweti akhale osatsimikiza, ndiye mitundu ya nsalu ya sweti ndi yotani? 1. ubweya...
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