line of defense   (TTS Sound)

The line_of_defense has 2 Senses.

• line of defence, line of defense
• any organization whose responsibility it is to defend against something; "police are the major line of defense against crime"
• 何かに対して防衛することを責務とする組織

• line of defence, line of defense
• defensive structure consisting of a barrier that can be employed for defense against attack
• 攻撃に対する防御に使用できる遮断物からなる防御構造