The Portuguese contestants sing Chinese songs during the Portuguese singing Chinese song contest held at the Macau Science and Cultural Center in Lisbon, Portugal, on April 15, 2018. (Xinhua/Zhang Liyun)

The Portuguese contestants sing Chinese songs during the Portuguese singing Chinese song contest held at the Macau Science and Cultural Center in Lisbon, Portugal, on April 15, 2018. (Xinhua/Zhang Liyun)

The Portuguese contestants sing Chinese songs during the Portuguese singing Chinese song contest held at the Macau Science and Cultural Center in Lisbon, Portugal, on April 15, 2018. (Xinhua/Zhang Liyun)

The Portuguese contestants sing Chinese songs during the Portuguese singing Chinese song contest held at the Macau Science and Cultural Center in Lisbon, Portugal, on April 15, 2018. (Xinhua/Zhang Liyun)