These so - called «restriction factors» are a first line of defence against viral infections, and constitute an important component of the innate immune response. (sciencedaily.com)
The immune system is literally the body's first and last line of defence against illness and disease, so the stronger it is, the better. (anabolicsmall.com)
Providing regular training in cyber security is essential to keep staff aware of the company's policies and engaged as your first line of defence against cyber criminals. (lawyer-monthly.com)