1
on the cusp of sth
常用于比喻，表示处于重大变化的临界点。
She stood on the cusp of a new career.
她站在新事业的转折点上。
转折点；临界点
先理解核心含义，再看它在真实句子里的用法。
转折点；临界点
A point of transition, especially an important moment when a decision determines future events.
She stood on the cusp of a new career.
她站在新事业的转折点上。
常用于 on the cusp of，表示‘即将进入某种状态/新阶段’。
A sharp point or pointed end.
由两条相交弧线形成的尖点(如哥特式拱门的内弧)
point formed by two intersecting arcs (as from the intrados of a Gothic arch)
An important moment when a decision is made that will determine future events.
心脏瓣膜的薄三角形瓣叶
a thin triangular flap of a heart valve
The Gothic arch comes to a sharp cusp at the top.
哥特式拱门在顶部形成一个尖锐的尖顶。
The star symbol has five pointed cusps.
星形符号有五个尖角。
The curve has a cusp at the origin, where the direction changes abruptly.
该曲线在原点处有一个尖点，方向在此突然改变。
常用于比喻，表示处于重大变化的临界点。
She stood on the cusp of a new career.
她站在新事业的转折点上。
The cusp of the arch was perfectly carved.
拱门的尖顶雕刻得完美无瑕。
用于医学术语，指牙齿的尖端。
The dentist examined the cusp of the molar.
牙医检查了磨牙的牙尖。
Not this
The function cusps at x=0.
Use this
The function has a cusp at x=0.
Cusp 是名词，表示‘尖点’，不能用作动词。应使用 have a cusp 或 there is a cusp 等结构。
Not this
She is at the cusp of a breakthrough.
Use this
She is on the cusp of a breakthrough.
固定搭配介词应为 on，表示‘处于……的边缘/转折点’，而非 at。
Not this
We stood on the cusp of the mountain.
Use this
We stood on the peak of the mountain.
Cusp 特指曲线或拱门的尖点，不用于描述山峰，应改用 peak 或 summit。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
处于……的转折点；即将进入……
The country is on the cusp of a new era.
这个国家正处于一个新时代的转折点。
曲线的尖点
The cusp of the curve is where the direction changes suddenly.
曲线的尖点是方向突然改变的地方。
牙尖；牙齿咀嚼面上的突起
A dental cusp is one of the raised points on the chewing surface of a tooth.
牙尖是牙齿咀嚼表面上的突起之一。
星座交界（出生在相邻两个星座分界附近）
My birthday falls on the astrological cusp between Leo and Virgo.
我的生日落在狮子座与处女座之间的星座交界处。
即将……；正处于……的关键时刻
The company is on the cusp of a major breakthrough.
这家公司正处于重大突破的关键时刻。
处在两个时代或两种状态的转换分界点上
Many people born in 1980 are on the cusp between Generation X and Millennials.
很多1980年出生的人处在X世代与千禧一代的分界线上。
即将大获成功；处于腾飞的前夜
The team was on the cusp of greatness when their best player got injured.
球队即将大放异彩时，他们最好的球员却受伤了。
Use cusp naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
cusp = 曲线相交的尖点；想想字母C的弧线相交成一个尖角，站在尖端就是转折点。
语域：mixed 常见场景：新闻报道、日常对话、专题评论 表示“转折点、临界点”时，常见于固定搭配 on the cusp of，在新闻报道和日常话题中较自然；单独使用 cusp 则多用于书面或较正式的场合。
常用于短语 on the cusp of，表示处于转折点。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.