Tolong jelaskan mengenai Rainforest dari Kebun Bunga Singapura dalam bahasa melayu

The Singapore Botanic Gardens has a small tropical rainforest of around six hectares in size, which is older than the gardens itself. The rainforest and its bigger cousin at the Bukit Timah Nature Reserve are located within the Singapore's city limits. Singapore is one of the only two major cities with a tropical rainforest within its city limits, the other being Tijuca Forest in Rio de Janeiro.