I'm a blood donor; I can't risk any contagion.我是献血者，我不能冒任何接触传染的危险。You could never eliminate risk, but preparation and training could attenuate it.风险不可能完全消除，但可以通过防范和培训来降低。You're taking a big risk showing th...
Consultants in heliport development and helicopter operations. Specializes in planning, design and development of and helipads.为直升机机场及其营运提供顾问服务, 擅长直升机机场的规划 、 设计与开发....