Plymouth is the second largest city in the south-west of the UK after Bristol, and the area of the city still maintains the structure of most British cities, that is, the core area is basically half an hour from east to west or from south to north. The seaside here is still preserved for the military base and the large-scale yacht marina that can be opened to the outside world (reservation is required), but when we went there was winter, we didn't expect the temperature of close to 0 degrees or someone swimming in the sea, and we had to admire the physique of foreigners!