The body has natural defence mechanisms to protect it from disease.

人体对疾病具有先天性防御机制。

《牛津词典》

Intestinal mucosal immune system is the first line of defence that prevents animal body infection. It also is an important composition of whole animal body immune system.

肠道黏膜免疫是动物机体防止感染的第一防线，是整个动物机体免疫系统的重要组成部分。

youdao

Normally the body USES its defence or immune system together with inflammation to control infection.

人体正常地用它的防御或免疫系统和炎症一起控制感染。

youdao

The army's high command, an 18-man body including the 75-year-old defence minister, Muhammad Tantawi, the chief of staff, Sami Enan, and the commanders of service branches, specialist corps and military regions, suspended the constitution, dissolved Egypt's parliament and assumed control.

ECONOMIST: After Mubarak

Meanwhile, North Korea's new leader Kim Jong-un has been appointed "first chairman" of the country's top decision-making body, the National Defence Commission, state media say.

BBC: North Korea rocket launch fails

In June Mr Jang was promoted to the post of vice-chairman of the National Defence Commission, the country's decision-making body.

ECONOMIST: North Korea's succession