1.to open sth up or to open up sth
+ building打开…的门；+ door, window打开
I opened up the sunroof to let the sun stream in.我打开天窗, 让阳光照进来。
2.to open sth up or to open up sth
+ shop使开门营业
Three armed men were waiting when the postmaster arrived to open up the shop.邮政局长到邮局开门营业时, 3名持械男子正等在那里。
3.(widen)to open sth up or to open up sth
+ market开放；放开
If the agreement is to succeed, the EU must open up its markets.协议若要生效, 欧盟必须开放其市场。
+ possibilities, opportunities增大；增加
The system is opening up business opportunities in emerging markets.这一体系正增加新兴市场的商业机会。