Photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Aerial photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Aerial photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Aerial photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Aerial photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)

Aerial photo taken on Nov. 14, 2018 shows the scenery of redwood forest at the Tianquan Lake scenic area in Xuyi County, east China's Jiangsu Province. (Xinhua/Zhou Haijun)