1 | Technological innovation is one of the necessary conditions for economic growth. | |
2 | Certification is a necessary requirement in this profession. | |
3 | Mastering the basic knowledge is a necessary condition for advanced skills. | |
4 | Enduring arduous and strenuous training is a necessary requirement for becoming a special forces soldier. | |
5 | The blood circulation is a necessary condition for maintaining normal functions of various organs in human body. |