此外，如果没有不时的火灾，森林会变得拥挤和不健康。
Also, without fires from time to time, forests become overcrowded and unhealthy.
研究人员表示，为了确保城市健康发展，种植和保护树木是必要的，但我们还需要做更多的工作来更好地了解城市树木，因为它们可能与乡村森林不同。
Researchers say planting and protecting will be needed to make sure cities can develop healthily, but more needs to be done to have a better understanding of city trees which may be different from countryside forests.
印度尼西亚西加里曼丹的一家诊所致力于为人们健康及森林提供支持。
A clinic in West Kalimantan, Indonesia, works to support the health of people and forests.
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