at the critical stage of的意思

水至清则无鱼,人至察则无友.Brown projects:Projects covering the immediate and most critical environmental problems facing cities.
"棕色项目:指解决城市面临的最迫切和紧急的环境问题的项目.参见green projects,blue projects" The patient's condition is very critical and he is in a comatose state.
病人的情况非常危急,他已经处于昏迷状态.It is requested that you issue me a new I-20 form with correct information as soon as you can.The American consul here is very critical.
特去信请求尽快寄发正确填写的新的I-20表格.这里的美领馆非常顶真.An area of critical importance in the design of power system is the consideration of the insulation requirements for lines,cables and stations.
电力系统设计的一个极重要方面是考虑线路、电缆和变电站的绝缘要求.