1 B2 中性
采取预防措施,阻止有害事情发生。
"You should always guard against complacency — that's when most mistakes are made."
“
"We must guard against the acquisition of unwarranted influence, whether sought or unsought, by the military-industrial complex."
— President Dwight D. Eisenhower, Farewell Address, January 17, 1961
不可分离