Ainda não temos significados para "annual problem".
1The air pollution or haze has been an annual problem for the past 18 years in Indonesia.
2Wildfires are an annual problem in Portugal.
3With the coming of the warm weather, the annual problem of the ventilation of the Dublin tram-cars becomes acute.
4Flooding is an annual problem that's worsening with climate change and poor maintenance of the channels that carry out the excess water.
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