http://members.rogers.com/louiezhang/bridge/sayc1.mht
http://members.rogers.com/louiezhang/bridge/sayc2.mht
Conventions:(约定叫)http://members.rogers.com/louiezhang/bridge/sayc3.mht
http://members.rogers.com/louiezhang/bridge/sayc2.mht
Conventions:(约定叫)http://members.rogers.com/louiezhang/bridge/sayc3.mht