Exchanges and cooperation in the fields of education, culture and defense have been expanding continuously and people-to-people contacts have also been very close.

教育、文化、防务等领域交流合作持续扩大，民间往来密切。

youdao

With the extensive use of antibiotics people have been paying attention to the effects of antibiotics on the host's defense system.

抗生素的广泛应用使人们注意到它对机体防御功能的影响。

youdao

NATO is an alliance of democracies. And many of its members have had a lot of trouble convincing their parliaments, and their people, to spend money on defense during what seems like a peaceful time in Europe.

VOA: standard.2010.06.11

In the more than 36 years I have practiced criminal defense law, I have had many occasions to represent people who, out of self-interest, chose to cooperate with law enforcement against others in order to avoid criminal prosecution or obtain leniency.

FORBES: Why do people have a negative view of cooperators?

Does the White House have any obligation to provide a support structure in defense of some of these people whose names have been mentioned as potential Cabinet nominees in the interim or while they're in this limbo waiting for a formal announcement?

WHITEHOUSE: Press Briefing

Curtis attorney Hal Neilson said the defense gave authorities a list of people who may have had a reason to hurt Curtis and Dutschke's came up.

NPR: Hearing For Miss. Man In Suspicious Letters Case