Sometimes ago, the United States Navy, for instance,
例如，美国海军前些时候
新概念英语第四册
Lesson 25 Non-auditory effects of noise
📚 句中词汇解析
从本句中提取的重要词汇
adv. 有时，间或;时而;
💡 sometime某一时间的+s表副词 →有时
"Even friends disagree sometimes."
即便是朋友有时也有分歧。
近义：occasionally, oft, once, rarely, betweentimes, betweenwhiles
反义：invariably, periodically, repeatedly, steadily, usually, consistently
n. 例子，实例;情况;要求，建议;[法]诉讼手续;
vt. 举…为例;
💡 in(upon)+stan(stand)+ce(名词后缀)→建议；实例；诉讼程序；例证
"It is not a unique instance , but has its counterpart."
无独有偶.
近义：exemplify, occurrence, example, occasion, opportunity, case
united
[[ju:'naitid]]
a. 联合的, 团结的, 一致的, 和睦的\\n[法] 联合的, 统一的, 一致的
近义：joined, joint, associated, near, nearby, neighboring
反义：isolated, remote, retired, segmented, separated, severed