1
be unnoticeable
系表结构，描述某物不引人注意。
The stain on the wall is almost unnoticeable.
墙上的污渍几乎不显眼。
不显眼的；不易察觉的
先理解核心含义，再看它在真实句子里的用法。
不显眼的；不易察觉的
Not noticeable.
The stain on the wall is almost unnoticeable.
墙上的污渍几乎不显眼。
不显眼的；难以察觉的。
Not noticeable.
The stain on the carpet was almost unnoticeable.
地毯上的污渍几乎看不出来。
She made a small, unnoticeable change to the document.
她对文件做了一个微小、不引人注意的改动。
The difference between the two colors is unnoticeable to most people.
这两种颜色之间的差别对大多数人来说是察觉不到的。
系表结构，描述某物不引人注意。
The stain on the wall is almost unnoticeable.
墙上的污渍几乎不显眼。
指明对于某人来说不可察觉。
The change in temperature was unnoticeable to most people.
温度变化对大多数人来说不明显。
与 remain 连用，表示持续不被察觉。
Her mistake remained unnoticeable until the final review.
她的错误直到最终审查才被注意到。
Not this
She slipped out of the room unnoticeable.
Use this
She slipped out of the room unnoticeably.
形容词“unnoticeable”不能修饰动词“slipped out”，应使用副词“unnoticeably”来修饰动作的方式。
Not this
The error went unnoticeable.
Use this
The error went unnoticed.
“go unnoticed”是固定搭配，表示“未被注意”，而“unnoticeable”强调事物本身不易被察觉的特性，不用于描述“变得未被注意”的过程。
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Dictionary facts from ECDICT, WIKTIONARY.