The two tested negative after being quarantined for 14 days.
The two economies have become closely interconnected, with both sides benefiting tremendously from their business cooperation, Li said at a news conference after the closing of the third session of the 13th National People's Congress.
The two countries can also expand industrial cooperation by jointly building digital infrastructure.
The train transported 20 containers carrying coal, ore and electronic products to the southern Chinese city of Nanning.
The two countries "are expected to play a much greater role in international affairs", said Surie, who is also a former Indian ambassador to China.
The tweet by Trump marked a fresh sign that the "America first" president was ready to go his own way yet again as world leaders gather to remember the coalition that brought an end to the first global war in which millions were killed.
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The two scientists said that infrasound and ultrasound frequencies alike cannot be easily directed. They tend to spread in all directions, making it impossible to target them at a single individual in a room.
The two sides also exchanged views on international trade, the Iran nuclear issue and other issues of common concern.
The two sides agreed to strengthen diplomatic efforts to turn a peace momentum, which was recently being created on the peninsula, into a peaceful resolution of the nuclear issue.
The train is also designed with an area to store snowboards, a device to secure wheelchairs and a mobile news center where passengers can watch live Olympic broadcasts.