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play + [game noun]
表示玩牌、下棋或赌博时，游戏名称前通常不加冠词，roulette 是不可数名词。
They played roulette all night.
他们整晚都在玩轮盘赌。
转迹线
先理解核心含义，再看它在真实句子里的用法。
转迹线
roulette
They played roulette all night.
他们整晚都在玩轮盘赌。
数学术语；指一图形沿另一图形滚动时，其上一点画出的曲线。
一种机会游戏,小球在分为编号(通常红黑)格子的圆盘上快速旋转,停止时决定各种赌注的结果。
A game of chance in which a small ball is made to move round rapidly on a circle divided off into numbered (usually red and black) spaces. When the ball stops, it indicates the result of a variety of wagers permitted by the game.
由一个图形上的点绕另一个图形滚动生成的线
a line generated by a point on one figure rolling around a second figure
冒险行为,尤指潜在损失大于收益(与轮盘赌仅输赌注不同)。
An instance of risk-taking, especially when the downside exceeds the upside (contrary to the game of roulette where only the wager is lost).
带齿轮的轮子,用于制作一排穿孔
a wheel with teeth for making a row of perforations
In geometry, a roulette is the curve traced by a point on one shape as it rolls around another shape.
在几何学中，转迹线是一个图形上的点绕着另一个图形滚动时留下的曲线。
The teacher showed us a roulette drawn by rolling a small circle around a larger circle.
老师向我们展示了一条由小圆绕大圆滚动绘制出的转迹线。
These roulettes appear in the design of certain gears and mechanical parts.
这些转迹线出现在某些齿轮和机械零件的设计中。
表示玩牌、下棋或赌博时，游戏名称前通常不加冠词，roulette 是不可数名词。
They played roulette all night.
他们整晚都在玩轮盘赌。
roulette 可直接作定语修饰名词，如 roulette wheel（轮盘）、roulette table（轮盘赌桌）。
She watched the roulette wheel spin.
她看着轮盘赌的轮盘转动。
at + 游戏名称表示“参与某种赌博/游戏”，常与 lose、win 等动词连用。
He lost a fortune at roulette.
他在轮盘赌上输了一大笔钱。
Not this
I lost all my money playing a roulette.
Use this
I lost all my money playing roulette.
轮盘赌作游戏名时是不可数名词，不能说 a roulette；表示“玩轮盘赌”直接用 play roulette。
Not this
He likes to gamble roulette.
Use this
He likes to play roulette.
gamble 是不及物动词，不能直接接游戏名作宾语；表示“玩轮盘赌”应用 play roulette。
Not this
They spent the night playing at roulette.
Use this
They spent the night playing roulette.
play 后接游戏名称时是及物用法，不需要加介词 at；play at roulette 不自然，去掉 at 即可。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
玩轮盘赌
They spent the night playing roulette at the casino.
他们整晚都在赌场玩轮盘赌。
轮盘赌转轮
The dealer spun the roulette wheel and everyone watched the ball.
荷官转动轮盘赌转轮，大家注视着那颗球。
轮盘赌桌
Please place your chips on the roulette table before the next spin.
请在下一轮旋转前把筹码放到轮盘赌桌上。
轮盘赌球
The roulette ball bounced and finally settled on red 7.
轮盘赌球弹跳了几下，最后停在红色7号上。
俄罗斯轮盘赌
Driving without a seatbelt is Russian roulette.
开车不系安全带就像玩俄罗斯轮盘赌。
玩命的行为；极度危险的冒险
Crossing the street without looking is Russian roulette in heavy traffic.
在繁忙的车流中不看路就过马路是在玩命。
轮盘赌的轮盘没有记忆。
He played roulette all night and lost all his chips.
他整晚玩轮盘赌，输光了自己的筹码。
Use roulette naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住‘轮盘赌’的轮子不断滚动，滚出的轨迹就是 roulette（转迹线）。
语域：formal 常见场景：geometry textbooks、academic papers on mathematics 此处指几何术语“转迹线”（一个图形上的点沿另一个图形滚动产生的曲线），通常出现在数学教材、学术论文中，偏正式书面语；日常口语中的“轮盘赌”非此义。
roulettes
Dictionary facts from ECDICT, WIKTIONARY.