necessity

necessity certificate

[经] 需要证明书

necessity for life

[经] 生活必需品

necessity in defence

[法] 必要自卫, 正当防卫

Necessity knows no law

情出无奈罪可赦免

necessity of confidentiality

[法] 必要信任

necessity of self-protection

[法] 必要自卫, 正当自卫