Tourists walk in a forest at Bois de la Cambre in Brussels, Belgium, Aug. 3, 2019. (Xinhua/Zhang Cheng)

Several tortoises are seen at the Leopold Park in Brussels, Belgium, Aug. 4, 2019. (Xinhua/Zhang Cheng)

People ride bikes near the EU headquarters in Brussels, Belgium, June 21, 2019. (Xinhua/Zhang Cheng)

A singer performs at a music show to mark the National Day of Belgium in Brussels, Belgium, July 20, 2019. (Xinhua/Zhang Cheng)

A woman is seen at the Leopold Park in Brussels, Belgium, Aug. 4, 2019. (Xinhua/Zhang Cheng)

People rest on the grassland at the Cinquantenaire Park in Brussels, Belgium, June 21, 2019. (Xinhua/Zhang Cheng)