firefighting; fire control

national defense

to protect; to defend; to guard against; to prevent

to guard against; to be vigilant; watch you don't (slip); Taiwan pr. [ti2 fang2]

to prevent; to take precautions against; to protect; to guard against; precautionary; prophylactic

to take strict precautions; on your guard

civil air defence (abbr. for 人民防空[ren2 min2 fang2 kong1])

security measures (esp. border security); official seal (esp. military seal during Qing and Ming times)

city defense

dike; embankment; levee

(gaming) tower defense

to reinforce defenses

fortified gate

to lay out a defense

guardedness; wariness; mental defenses

to relieve a garrison; to change guard complement

to attack and defend (usu. in reference to opposing sides, but can be one party playing both roles)

civil defense

Haiphong, a major port city in northern Vietnam

coastal defense

(video games) to break through an opponent's defenses; (slang) to break through sb's emotional defenses; to get to sb emotionally

air force; air defense

to set up defenses; to fortify

to relieve a garrison

to guard against; to beware of

frontier defense

unexpectedly; suddenly; at unawares; off guard; against expectations

suddenly; unexpectedly; taken by surprise; at unawares

Kinderdijk, village in the Netherlands with a large network of windmills attracting many tourists

to be caught off guard; without warning

(idiom) virtually impossible to prevent

see 明槍易躲，暗箭難防|明枪易躲，暗箭难防[ming2 qiang1 yi4 duo3 , an4 jian4 nan2 fang2]

lit. easy to dodge the spear in the open, hard to avoid a stab in the dark (idiom); it is hard to guard against secret conspiracies