They are similar, but "isolated" is much more common. "Insular" is more formal, and is also an adjective form of "island." Some examples" "I feel isolated." 对 "I feel insular." 错 "He is an insular person." 对 （他不常离开家乡，所以不了解别人的生活，或者不喜欢外国人） "He is an isolated person." 奇怪 "Hainan is an insular province." 对