1. It drags very slightly in the middle, but that's almost unnoticeable -- and the only flaw I can pick out in this book. 中间部分有很细微的拖沓，但这几乎无法察觉--而且是这本书中我唯一可以挑出来的瑕疵。
2. Symptoms can be a clue or a warning, but may be mild, unnoticeable, or easily mistaken for another type of irritation. 症状只能做为一种暗示或警告，但有时会很轻微，很难被发现，或者很容易与其他疾病混淆。
3. Shaeffer's Los Angeles-based company is the maker of an almost unnoticeable nail polish that has proved a hit with men. 谢弗的洛杉矶总公司制造了一种几乎不为人所察觉的指甲油，受到男性的欢迎。
英英解释
adj.
1. not obtrusive or undesirably noticeable
2. not noticeable; not drawing attention
3. not drawing attention
