Turkmen President Gurbanguly Berdimuhamedov speaks via video link at the opening ceremony of the Second United Nations Global Sustainable Transport Conference, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Yin Gang)

Panamanian President Laurentino Cortizo speaks via video link at the opening ceremony of the Second United Nations Global Sustainable Transport Conference, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Yin Gang)

Dutch Prime Minister Mark Rutte speaks via video link at the opening ceremony of the Second United Nations Global Sustainable Transport Conference, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Li He)

Ethiopian President Sahle-Work Zewde speaks via video link at the opening ceremony of the Second United Nations Global Sustainable Transport Conference, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Yin Gang)

Russian President Vladimir Putin speaks via video link at the opening ceremony of the Second United Nations Global Sustainable Transport Conference, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Yin Gang)

Visitors are seen at the venue of the Second United Nations Global Sustainable Transport Conference in Beijing, capital of China, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Li He)

Visitors are seen at the venue of the Second United Nations Global Sustainable Transport Conference in Beijing, capital of China, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Li He)

Photo taken on Oct. 14, 2021 shows the opening ceremony of the Second United Nations Global Sustainable Transport Conference in Beijing, capital of China. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Li He)

Photo taken on Oct. 14, 2021 shows the logo of the Second United Nations Global Sustainable Transport Conference in Beijing, capital of China. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Li He)

Visitors are seen at the venue of the Second United Nations Global Sustainable Transport Conference in Beijing, capital of China, Oct. 14, 2021. The Second United Nations Global Sustainable Transport Conference kicked off on Thursday in Beijing. The three-day conference will be held both online and offline. (Xinhua/Li He)

来源：Xinhua