This is why some people call the pisonia the "Bird catcher tree". 这也是人们称腺果藤树为“捕鸟树”的原因
Few people ever see this extraordinary annual event. 这一蔚为壮观的场面一年一次 但却很少有人亲眼目睹
For 500 years people have been harvesting the nests of cave swiftlets. 500年来 人们一直采集洞金丝燕的燕窝
there were one and a half billion people on Earth. 地球上生活着15亿人