Tourists visit the West Lake scenic area in Hangzhou, capital of east China's Zhejiang Province, May 16, 2018. A heat wave hit Hangzhou in recent days, raising the highest temperature to over 35 degrees Celsius. (Xinhua/Weng Xinyang)

Tourists visit the West Lake scenic area in Hangzhou, capital of east China's Zhejiang Province, May 16, 2018. A heat wave hit Hangzhou in recent days, raising the highest temperature to over 35 degrees Celsius. (Xinhua/Weng Xinyang)

Aerial photo taken on May 16, 2018 shows the West Lake scenic area in Hangzhou, capital of east China's Zhejiang Province. A heat wave hit Hangzhou in recent days, raising the highest temperature to over 35 degrees Celsius. (Xinhua/Weng Xinyang)

Aerial photo taken on May 16, 2018 shows the West Lake scenic area in Hangzhou, capital of east China's Zhejiang Province. A heat wave hit Hangzhou in recent days, raising the highest temperature to over 35 degrees Celsius. (Xinhua/Weng Xinyang)

Tourists visit the West Lake scenic area in Hangzhou, capital of east China's Zhejiang Province, May 16, 2018. A heat wave hit Hangzhou in recent days, raising the highest temperature to over 35 degrees Celsius. (Xinhua/Weng Xinyang)