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。
