Visitors view the autumn scenery at the Woluwe Park in Brussels, Belgium, Nov. 9, 2019. (Xinhua/Zhang Cheng)

People walk at the Leopold Park in Brussels, Belgium, Nov. 20, 2019. (Xinhua/Zhang Cheng)

Photo taken on Nov. 20, 2019 shows fallen leaves at the Park of the Fiftieth Anniversary in Brussels, Belgium. (Xinhua/Zhang Cheng)

Photo taken on Nov. 22, 2019 shows the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium. (Xinhua/Zhang Cheng)

A visitor enjoys the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium, Nov. 22, 2019. (Xinhua/Zhang Cheng)

A visitor takes photos of the autumn scenery at the Woluwe Park in Brussels, Belgium, Nov. 9, 2019. (Xinhua/Zhang Cheng)

People walk at the Park of the Fiftieth Anniversary in Brussels, Belgium, Nov. 20, 2019. (Xinhua/Zhang Cheng)

Visitors enjoy the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium, Nov. 22, 2019. (Xinhua/Zhang Cheng)

Visitors view the autumn scenery at the Woluwe Park in Brussels, Belgium, Nov. 9, 2019. (Xinhua/Zhang Cheng)

Visitors enjoy the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium, Nov. 22, 2019. (Xinhua/Zhang Cheng)

Photo taken on Nov. 22, 2019 shows the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium. (Xinhua/Zhang Cheng)

Photo taken on Nov. 22, 2019 shows the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium. (Xinhua/Zhang Cheng)

Photo taken on Nov. 22, 2019 shows the autumn scenery at the Groot-Bijgaarden Castle in the suburb of Brussels, Belgium. (Xinhua/Zhang Cheng)

Photo taken on Nov. 20, 2019 shows the autumn scenery at the Park of the Fiftieth Anniversary in Brussels, Belgium. (Xinhua/Zhang Cheng)