We drift around the old centre of Ribadeo with its ornate turn-of-the-20th-century houses, but not for long.

我们在里瓦德奥的老城中心漫步，这里有很多二十世纪初的老房子。

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"The Rydberg electron resembles a sheepdog that keeps its flock together by roaming speedily to the outermost periphery of the flock, and nudging back towards the centre any member that might begin to drift away, " said Professor Greene.

BBC: World first for strange molecule