Generally, the host doesn't open the gift in front of the guest, but waits until the guest has left to open it.
客人送上了礼物之后，收礼的.人一般不当面把礼物打开，而是等到客人离去后才打开。
The agreement will open the door to increased international trade.
此协议将会提供增加国际贸易的机会。
This new job could open up whole new vistas for her.
这项新工作可能给她开辟全新的前景。
The new sports complex is on target to open in June.
新建的体育中心将在六月份如期开放。