Guests are seen at the outdoor area of a restaurant in Berlin, capital of Germany, May 21, 2021. Restaurants in Berlin are allowed to serve guests outdoors from Friday. (Photo by Stefan Zeitz/Xinhua)

Guests are seen at the outdoor area of a restaurant in Berlin, capital of Germany, May 21, 2021. Restaurants in Berlin are allowed to serve guests outdoors from Friday. (Photo by Stefan Zeitz/Xinhua)

A guest shows a waiter required information to dine at the outdoor area of a restaurant in Berlin, capital of Germany, May 21, 2021. Restaurants in Berlin are allowed to serve guests outdoors from Friday. (Photo by Stefan Zeitz/Xinhua)

Guests are seen at the outdoor area of a restaurant in Berlin, capital of Germany, May 21, 2021. Restaurants in Berlin are allowed to serve guests outdoors from Friday. (Photo by Stefan Zeitz/Xinhua)