Mr Obama was visiting China's Great Wall, before heading to South Korea.

奥巴马先生在他飞往南韩之前，参观了中国的万里长城。

youdao

Mr Obama was visiting China's Great Wall, before heading to South Korea.

奥巴马先生在他飞往南韩之前，参观了中国的万里长城。

youdao