三级aa视频在线观看-三级国产-三级国产精品一区二区-三级国产三级在线-三级国产在线

Programme Introduction 節目簡介

When we talk about swans, the words which come into our mind are elegance and grace. They are a delight to see in rivers around the UK and people love their beauty.

However, some environmentalists are worried these beautiful birds are now becoming a hazard to other river inhabitants.

So what's the real story about swans and are there any solutions to this problem?

Find out more with Chen Li and Helen.

天鵝讓人聯想起高貴和優雅，它們的出現對河流多加了一些色彩和美感。人們對它們非常喜愛。

可是現在有些環保人士擔心天鵝的飲食習慣破壞了河流的生態平衡。

這到底是怎么一回事兒呢？有沒有什么解決方式？

本期節目陳藜和 Helen 為您講解。