clear 本词
Means completely see-through with no cloudiness at all; the natural word for liquids like water and for colorless glass, rather than for plastic sheeting or fabric.
表示完全透明、毫无浑浊，是形容水等液体以及无色玻璃的自然用词，而不是用来形容塑料薄片或布料。
The stream was so clear that every pebble on the bottom was visible.
小溪如此清澈，以至于河底的每一颗鹅卵石都清晰可见。
transparent
The neutral, precise word for materials that let light and detailed images pass through so things behind them are fully visible; common for glass and plastic, and in formal or technical descriptions.
是描述材料能让光线和清晰影像穿透、使背后物体完全可见的中性、精确用词，常用于玻璃和塑料，也常见于正式或技术性描述中。
The scientist placed the sample in a transparent container to observe the reaction clearly.
科学家把样本放进一个透明的容器里，以便清楚地观察反应过程。
translucent
Lets light pass through but scatters it, so shapes are blurred and details cannot be seen clearly; used for frosted glass, curtains, or wax paper, unlike the other two, which imply a clear view.
能透光但会使光线散射，因此形状模糊、细节无法看清，常用于磨砂玻璃、窗帘或蜡纸，不同于另外两个词所暗示的清晰视野。
The curtains were translucent, softening the sunlight without letting anyone see clearly into the room.
窗帘是半透明的，让阳光变得柔和，同时不让人看清房间里面的情况。

Clear, transparent, and translucent all describe letting light through. Clear means completely see-through with no cloudiness, like water. Transparent is the neutral word for materials you can see clearly through, like glass or plastic. Translucent means light passes through but is scattered, so shapes blur.

这三个词都可以形容材料或介质能否让光线或视线穿透，但清晰度和常见搭配不同：clear强调完全透明、毫无浑浊，多用于清水或无色玻璃；transparent是描述材料透光、能清楚看到内部或背后物体的中性说法；translucent则是能透光却会使光线散射、看不清细节，常用于磨砂玻璃或窗帘。这里不比较clear表示“清晰易懂”（如说明清晰）的义项，也不比较transparent表示“公开、不隐瞒”（如财务透明）的义项。

Compared meaning: easy to understand (adjective).

比较义项：清楚易懂的（形容词）。

clear 本词
A general, everyday word for anything easy to understand or see the meaning of; used freely in speech and writing for instructions, ideas, sounds, or writing style.
一个通用的日常词，指任何容易理解或看懂其含义的事物；可自由用于口语和书面语中描述说明、想法、声音或写作风格。
Could you make your instructions a bit clearer for the new staff?
你能把给新员工的说明写得更清楚一些吗？
defined
Almost always used as a past participle (often with 'clearly'), stressing that the limits, scope, or responsibilities of something have been explicitly set out, not just easy to follow.
几乎总是以过去分词形式使用（常与 clearly 搭配），强调某事物的界限、范围或职责已被明确规定，而不仅仅是容易理解。
Each team member's responsibilities are clearly defined in the contract.
合同中明确规定了每个团队成员的职责。

Clear and defined both describe something easy to understand. Clear is a general word used for instructions, ideas, or sounds that are easy to follow. Defined is almost always used as 'clearly defined', stressing that the limits or responsibilities of something have been explicitly set.

这两个词都形容事物容易理解，但 clear 更口语、通用，可用于说明、思路、声音等多种事物；defined 强调边界、范围或职责被明确划定，常用于角色、条款、目标等抽象事物，且几乎总以过去分词（defined / clearly defined）形式出现，很少作独立形容词使用。

Compared meaning: simple and easy to understand (adjective).

比较义项：简洁明了、易于理解（形容词）。

clear 本词
Clear emphasizes the absence of confusion or ambiguity, applying broadly to instructions, explanations, or thinking that are easy to follow.
clear 强调没有混乱或歧义，适用范围广，常用于容易理解的说明、解释或思路。
Her instructions were so clear that nobody had any questions afterward.
她的指示非常明确，以至于之后没有人有任何疑问。
clean
Clean emphasizes a simple, uncluttered style with nothing unnecessary, often describing writing, design, or code.
clean 强调风格简洁、不啰嗦，没有多余的成分，常用来形容写作、设计或代码。
The design was refreshingly clean, with no unnecessary clutter on the page.
这个设计干净利落，令人耳目一新，页面上没有多余的杂乱元素。

Clear and clean both can mean simple and easy to understand. Clear stresses the absence of confusion or ambiguity, used for instructions, explanations, or thinking. Clean stresses a simple, uncluttered style with nothing unnecessary, often for writing, design, or code.

这两个词都可以形容“容易理解”，但侧重不同：clear 强调没有混乱或歧义，适用范围广，可指说明、解释、思路等；clean 强调风格简洁、不啰嗦，没有多余的成分，常用于写作、设计或代码。这里不比较 clear 的“晴朗的、透明的”义，也不比较 clean 的“干净的（打扫）”义。