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an evergreen
作名词时，evergreen 是可数名词，指常绿树或常绿植物；复数形式为 evergreens。
The pine is an evergreen, so it keeps its needles all winter.
松树是常绿树，所以整个冬天都保持针叶。
常绿树；常绿植物
先理解核心含义，再看它在真实句子里的用法。
常绿树；常绿植物
a plant that keeps its leaves green throughout the year
The pine is an evergreen, so it keeps its needles all winter.
松树是常绿树，所以整个冬天都保持针叶。
A shrub or tree that does not shed its leaves or needles seasonally.
常绿植物；全年保持绿叶的植物
a plant having foliage that persists and remains green throughout the year
In our garden, the evergreen behind the garage stays green even in winter.
在我们花园里，车库后面的那棵常绿树即使在冬天也保持绿色。
Many birds build their nests in the dense branches of that tall evergreen.
许多鸟在那棵高大常绿树的茂密枝条上筑巢。
These evergreens provide shade and privacy around the house all year round.
这些常绿植物全年为房子周围提供阴凉和私密性。
作名词时，evergreen 是可数名词，指常绿树或常绿植物；复数形式为 evergreens。
The pine is an evergreen, so it keeps its needles all winter.
松树是常绿树，所以整个冬天都保持针叶。
作形容词时，evergreen 常放在名词前作定语，表示“常绿的”。
They planted evergreen shrubs around the house.
他们在房子周围种了常绿灌木。
作表语时，evergreen 说明主语是常绿的，常用来描述植物在冬季仍保持绿叶。
These plants are evergreen and stay green year-round.
这些植物是常绿的，全年保持绿色。
Not this
A pine is a evergreen tree.
Use this
A pine is an evergreen tree.
evergreen 以元音音素 /ɛ/ 开头，前面必须用 an，不能用 a。中国学习者常因中文没有冠词而忽略元音起始，只按字母 e 判断。
Not this
These plants are evergreen because they come back every year.
Use this
These plants are perennial because they come back every year.
evergreen（常绿的）指叶子全年保持绿色，perennial（多年生的）指植株能生长多年并每年重新萌发。把“每年重新生长”说成 evergreen，是混淆了汉语“常绿”和“多年生”两个概念。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
常绿树
The garden is full of evergreen trees.
这个花园里长满了常绿树。
常绿林
Evergreen forests are common in the Pacific Northwest.
常绿林在太平洋西北地区很常见。
常绿植物
These evergreen plants are easy to care for.
这些常绿植物很容易照料。
常绿灌木
An evergreen shrub can provide privacy in winter.
常绿灌木能在冬季提供私密性。
常绿的叶子
The evergreen leaves of the holly tree look beautiful in snow.
冬青树常绿的叶子在雪中看起来很漂亮。
保持常绿
Some tropical trees remain evergreen throughout the year.
一些热带树木全年保持常绿。
常青内容（长期不过时的内容）
Our blog attracts regular readers because it focuses on evergreen content.
我们的博客专注于常青内容，因此吸引了稳定的读者。
永不过时的话题
Education is an evergreen topic that always sparks discussion.
教育是一个永不过时的话题，总能引发讨论。
经久不衰的经典作品
That film is an evergreen classic, still loved by new generations.
那部电影是一部经久不衰的经典，仍深受新一代喜爱。
常青，温柔而温暖，你就是那常青之树。
From the Academy Award-winning song 'Evergreen (Love Theme from A Star Is Born)' by Barbra Streisand, featured in the 1976 film A Star Is Born.
出自芭芭拉·史翠珊荣获奥斯卡奖的歌曲《Evergreen（一个明星的诞生中的爱情主题）》，该曲见于1976年电影《一个明星的诞生》。
发长 /iː/ 音 (如 see, free)
Use evergreen naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拆成 ever（永远）+ green（绿），永远绿的就是常绿树。
语域：neutral 常见场景：botany、gardening、landscaping、nature writing 作名词指常绿植物时，多用于植物学、园艺或自然描写等语境；日常口语中也比较常见，语气中性，无明显的正式或非正式色彩。
green、screen、seen、bean、queen 与 evergreen 的结尾音节 /-ɡrin/ 押韵（元音和尾音都是 /-in/）；ever 与 evergreen 开头的 ever 同音。注意 every /ˈɛvri/ 虽拼写接近 ever，但发音不同；grain /ɡreɪn/ 与 green 拼写接近，但元音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.