flush

Compared meaning: a sudden strong flow of liquid (noun).

比较义项：液体骤然涌出（名词）。

• flush 本词

  Flush denotes a deliberate, often brief release of water, mainly in technical or plumbing contexts (e.g., flushing a system); it lacks gush's sense of violent, uncontrolled force.

  flush 指人为、往往短暂的放水动作，多用于管道或技术性场合（例如冲洗某个系统），不像 gush 那样带有猛烈、失控的意味。

  Engineers opened a valve to send a flush of water through the pipeline.

  工程师打开阀门，把一股水放入管道进行冲洗。

• gush

  Gush denotes a strong, sudden, often uncontrolled outward flow, as if bursting under pressure; it's the vivid, everyday word for liquid pouring out forcefully, unlike the more technical flush.

  gush 指液体猛烈、突然地大量涌出，仿佛在压力下喷发；它是日常生活中更常用、更生动的说法，不像 flush 那样偏技术性。

  A powerful gush of water shot up when the pipe burst underground.

  地下管道爆裂时，一股猛烈的水流喷涌而出。

Flush and gush both name a sudden strong flow of liquid, but the setting differs. Flush is used mainly in technical or plumbing contexts, for a deliberate, controlled release of water. Gush is the vivid, everyday word for liquid bursting out forcefully under pressure.

这两个词都可指液体突然涌出，但语气和使用场合不同：flush 常见于技术性或管道情境中，指人为、可控的放水；gush 则强调猛烈、不受控制地喷涌而出，是更常用、更生动的日常用语。此处不比较 flush 表示“脸红”“突然的兴奋或激动”等其他义项，也不比较 gush 表示“喋喋不休地夸赞”等其他义项。

Compared meaning: smooth and without slopes or gaps (adjective).

比较义项：表面平坦、无起伏或与相邻面齐平（形容词）。

• level

  Level describes a surface with no tilt, perfectly horizontal, often checked with a tool or against gravity; typically used for floors, tables, and ground.

  level 强调表面没有倾斜，完全水平，常靠工具或重力来检验，多用于地板、桌子、地面等。

  Check that the washing machine is level, or it will vibrate loudly.

  检查一下洗衣机是否放平，不然它运转时会剧烈震动。

• flat

  Flat describes a surface without bumps, curves, or slopes, evenly smooth overall, without implying it has been checked for horizontal tilt; used for land, roads, and surfaces generally.

  flat 强调表面没有凹凸、弯曲或坡度，整体平滑，不一定涉及是否水平的检验，多用于土地、道路及各种表面。

  The desert stretched out flat in every direction, without a single hill.

  沙漠向四面八方延伸得十分平坦，没有一座山丘。

• flush 本词

  Flush describes one surface being exactly even with an adjacent surface, with no gap or step between them; it is always used in relation to another surface.

  flush 强调某一表面与相邻表面完全齐平、之间没有缝隙或高低差，总是相对另一个表面而言。

  Sand down the patch until it's flush with the rest of the wall.

  把这块补丁打磨到与墙面其余部分齐平为止。

All three describe a flat surface. Level means horizontal, with no tilt. Flat means smooth, without bumps or curves. Flush means one surface is exactly even with the surface beside it. Other senses of these words are not compared here.

这三个词都能形容“平坦”的表面，但侧重点不同：level 强调水平、无倾斜；flat 强调没有凹凸起伏；flush 强调与相邻表面对齐、齐平。这里不比较 level 的“程度、水平”义（如例句中的 advanced level）、flat 的“公寓”义（如例句中的 a small flat）以及 flush 的“脸红”义（如例句中的 begin to flush）。

Compared meaning: a strong feeling of excitement or pleasure (noun).

比较义项：兴奋或愉悦的强烈感觉（名词）。

• boot

  Mainly used in the fixed phrase 'get a boot out of something'; informal and somewhat dated, rarely used outside this expression.

  主要用于固定短语“get a boot out of something”（从某事中获得快感），语气随意且略显过时，很少用于此短语之外。

  She always gets a real boot out of watching old cartoons.

  她看老动画片总能获得真正的快感。

• flush 本词

  Often used as 'a flush of' plus an emotion noun, describing a sudden rush of feeling; more literary, sometimes paired with a reddening of the face.

  常用“a flush of + 情感名词”的结构，描述突然涌起的情绪，文风更偏书面，有时伴随脸部泛红。

  He felt a flush of pride as his daughter crossed the finish line.

  看到女儿冲过终点线，他心中涌起一阵自豪的快感。

Boot and flush both mean a strong feeling of excitement. Boot appears only in 'get a boot out of it', sounding informal and old-fashioned. Flush is often 'a flush of excitement', more literary, sometimes with a red face. Other meanings are not compared here.

这两个词在表示“兴奋或愉悦带来的强烈快感”时意思相近，但语域和搭配不同：boot 几乎只出现在固定短语 get a boot out of 中，语气随意、略显过时；flush 常与 of 连用（a flush of excitement），风格更偏书面，也常伴随脸部泛红的生理反应。这里不比较 boot 的“靴子”“（英式）汽车后备箱”“（计算机）启动”等义项，也不比较 flush 的“脸红”“冲水”“扑克同花”“大量、充裕”等义项。