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be a wallflower
指在社交聚会上因害羞或被冷落而独自待在一边的人。
At the party, Tom was a wallflower and didn't dance at all.
在聚会上，汤姆是个壁花，完全没有跳舞。
桂竹香
先理解核心含义，再看它在真实句子里的用法。
桂竹香
any of various plants of the genus Erysimum with fragrant yellow, orange, or brownish flowers, especially the common wallflower that grows on old walls and cliffs
At the party, Tom was a wallflower and didn't dance at all.
在聚会上，汤姆是个壁花，完全没有跳舞。
糖芥属中几种短命草本或灌木,花从亮黄色到红色。
Any of several short-lived herbs or shrubs of the Erysimum genus with bright yellow to red flowers.
大花gastrolobium,一种有毒丛生灌木,澳大利亚特有。
Gastrolobium grandiflorum, a poisonous bushy shrub, endemic to Australia.
在聚会上因害羞或不讨喜而不跳舞的人；引申为在活动中被冷落在一旁的人。
A person who does not dance at a party, due to shyness or unpopularity; by extension, anyone who is left on the sidelines while an activity takes place.
At the party, I felt like a wallflower and spent most of the evening by the wall.
在聚会上，我觉得自己像个局外人，大部分时间都待在墙边。
She used to be a wallflower in high school, but now she is confident in group discussions.
她高中时很害羞，不擅长社交，但现在在小组讨论中很自信。
Don't be a wallflower—come join the dance with us!
别害羞退缩，来和我们一起跳舞吧！
指在社交聚会上因害羞或被冷落而独自待在一边的人。
At the party, Tom was a wallflower and didn't dance at all.
在聚会上，汤姆是个壁花，完全没有跳舞。
用于表达在人群中感到不受关注、不自在。
Whenever I go to these events, I feel like a wallflower.
每次参加这些活动，我都觉得自己像个壁花。
强调从积极参与到退缩边缘的转变。
After his illness, he slowly became a wallflower at social gatherings.
生病之后，他在社交聚会上渐渐变成了一个壁花。
Not this
He is wallflower at every dance.
Use this
He is a wallflower at every dance.
wallflower 表示“舞会上因害羞而没人邀请的人”时是可数名词，单数可数名词前需要不定冠词 a；中文没有冠词，所以容易漏掉。
Not this
Don't be so wallflower – go talk to someone!
Use this
Don't be such a wallflower – go talk to someone!
wallflower 是名词，不是形容词；表示“别那么腼腆、别当壁花”要用 such a wallflower，不能说 so wallflower。
Not this
I spent the whole evening as a wallflower in the party.
Use this
I spent the whole evening as a wallflower at the party.
社交聚会通常用 at the party 表示“在聚会上”；in the party 会让人误以为是在某个政党内部。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
当壁花；在社交场合因害羞或没人搭理而独自待着
She was a wallflower at the dance, hoping someone would ask her to dance.
她在舞会上当壁花，希望有人能请她跳舞。
社交壁花；社交场合中害羞退缩的人
He has always been a social wallflower, avoiding crowded rooms.
他一直是个社交壁花，回避拥挤的房间。
聚会壁花；聚会上独自待在角落的人
I was a party wallflower, standing by the snack table all night.
我整晚都是聚会壁花，一直站在零食桌旁。
（在社交场合）因害羞而待在角落不参与的人；局外人
Stop being a wallflower and go say hello to someone.
别再做害羞的局外人了，去跟别人打个招呼吧。
感觉自己像个局外人；感到被冷落
At the office party I felt like a wallflower because I didn't know anyone.
在办公室聚会上，我因为谁也不认识，觉得自己像个局外人。
壁花少年的好处
Title of a famous American coming-of-age novel and film; the word refers to a shy person who stays against the wall at a party.
一部美国知名成长小说和电影的书名/片名；该词指在派对上害羞地靠在墙边的人。
壁花，壁花，你愿意和我跳支舞吗？
A line from Bob Dylan's 1974 song 'Wallflower'.
鲍勃·迪伦1974年歌曲《Wallflower》中的一句歌词。
Use wallflower naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：wall(墙)+flower(花)——贴在墙边像花一样安静的人，即舞会上的局外人/壁花；也指桂竹香。
语域：mixed 常见场景：botany and gardening、social gatherings and dances、everyday informal conversation wallflower 通常有两个用法：一指植物桂竹香，多用于植物学或园艺语境；二指舞会或社交场合中害羞、少与人交谈的人，比较常见于日常口语和非正式描写。整体语体偏中性，具体使用视语境而定。
作名词时可数；表示‘舞会上没人邀请跳舞的人’时仍为可数名词。
Dictionary facts from ECDICT, WIKTIONARY.