The phrase "lush tropical rain forest" refers to a dense, green forest that is characterized by high rainfall and warm temperatures. These forests are typically found in regions close to the equator and have an abundance of plant life, including tall trees, vines, ferns, and orchids. The soil in these areas is often nutrient-rich due to the decomposition of leaves and other organic matter, which supports a diverse range of flora and fauna. Overall, "lush tropical rain forest" describes an environment that is rich with life and beauty.