A protective barrier is installed on top of the enclosure of giant panda Meng Lan at the Beijing Zoo in Beijing, Capital of China, Dec 20, 2021. This is the precaution made after Meng Lan's breaking through the enclosure last week.(Photo by Du Jianpo/Guangming photo)

A protective barrier is installed on top of the enclosure of giant panda Meng Lan at the Beijing Zoo in Beijing, Capital of China, Dec 20, 2021. This is the precaution made after Meng Lan's breaking through the enclosure last week. The photo shows tourists watching Meng Lan.(Photo by Du Jianpo/Guangming photo)

A protective barrier is installed on top of the enclosure of giant panda Meng Lan at the Beijing Zoo in Beijing, Capital of China, Dec 20, 2021. This is the precaution made after Meng Lan's breaking through the enclosure last week.(Photo by Du Jianpo/Guangming photo)

来源：GMW.cn