英语语法分析

The two-day Greater Mekong Subregion summit begins Sunday.

为期两天的大湄公河次区域首脑会议将于星期天开幕。

Other suspected foci have been identified in the Greater Mekong subregion, but are not yet confirmed.

在大湄公河次区域发现了其它疑似疫源地，但尚未确认。

Under the framework, China has actively participated in the Greater Mekong Subregion Economic Cooperation.

在该框架下，中国积极参与了大湄公河次区域经济合作。