People have meals in an outdoor dining bubble amid COVID-19 pandemic in Jerusalem, Nov. 26, 2020. Outdoor dining has been a widely adopted measure among restaurants to cope with the COVID-19 pandemic, but low temperatures and bad weathers bring new challenges as winter came. The dining bubble turns out to be a pragmatic solution. (Photo by Muammar Awad/Xinhua)

People have meals in an outdoor dining bubble amid COVID-19 pandemic in Jerusalem, Nov. 26, 2020. Outdoor dining has been a widely adopted measure among restaurants to cope with the COVID-19 pandemic, but low temperatures and bad weathers bring new challenges as winter came. The dining bubble turns out to be a pragmatic solution. (Photo by Muammar Awad/Xinhua)

People have meals in an outdoor dining bubble amid COVID-19 pandemic in Jerusalem, Nov. 26, 2020. Outdoor dining has been a widely adopted measure among restaurants to cope with the COVID-19 pandemic, but low temperatures and bad weathers bring new challenges as winter came. The dining bubble turns out to be a pragmatic solution. (Photo by Muammar Awad/Xinhua)

People have meals in an outdoor dining bubble amid COVID-19 pandemic in Jerusalem, Nov. 26, 2020. Outdoor dining has been a widely adopted measure among restaurants to cope with the COVID-19 pandemic, but low temperatures and bad weathers bring new challenges as winter came. The dining bubble turns out to be a pragmatic solution. (Photo by Muammar Awad/Xinhua)