A line of sunlight — one narrow shaft of it, travelling from the sun to whatever it lands on. The key idea is that you can see its shape.

A line of sunlight一道陽光 — one narrow shaft of it一束窄窄的光, travelling from the sun to whatever it lands on從太陽一路照到它落下的地方。The key idea重點是 is that you can see its shape你看得見它的形狀。

Ordinary daylight fills a room and has no edges. A sunbeam has edges: it comes through a gap in the curtains, a hole in the clouds, a crack in a wooden wall, a gap in the trees of a forest, and lies across the floor as a bright stripe.

Ordinary daylight一般的日光 fills a room填滿整個房間 and has no edges而且沒有邊界。A sunbeam陽光束 has edges是有邊界的: it comes through a gap in the curtains它會從窗簾的縫隙, a hole in the clouds雲的破洞, a crack in a wooden wall木牆的裂縫, a gap in the trees of a forest森林樹木間的空隙照進來, and lies across the floor as a bright stripe然後在地板上形成一條亮亮的光帶。

Dust floating in the air is what usually makes it visible — the tiny pieces catch the light so the beam looks almost solid, like something you could touch. That is why people say a cat is 'lying in a sunbeam' on the carpet, and why the word feels warm and homely.

Dust floating in the air空氣中飄浮的灰塵 is what usually makes it visible通常是讓它看得見的原因 — the tiny pieces catch the light這些小顆粒會把光反射出來 so the beam looks almost solid讓這道光看起來幾乎像實體一樣, like something you could touch好像可以摸得到。That is why people say a cat is 'lying in a sunbeam' on the carpet這就是為什麼大家會說貓「躺在地毯上的陽光裡」, and why the word feels warm and homely也是這個字讓人覺得溫暖、有家的感覺的原因。

The feeling of the word is gentle and slightly old-fashioned, closer to poems, children's books, and hymns than to science writing, which would say 'ray' or 'solar radiation'.

The feeling of the word這個字給人的感覺 is gentle and slightly old-fashioned是溫柔、帶點老派, closer to poems, children's books, and hymns比較接近詩、童書、和聖詩 than to science writing而不像科學寫作, which would say 'ray' or 'solar radiation'科學寫作會說'ray'（光線）或'solar radiation'（太陽輻射）。

Because of that warmth, English also uses it for people: a cheerful child, or someone who makes a room feel better, may be called 'a little sunbeam'. That use is affectionate and mostly said to or about children — said to an adult, it sounds either sweet or slightly sarcastic, depending on the face that says it.

Because of that warmth因為這種溫暖的感覺, English also uses it for people英文也會拿它來形容人: a cheerful child一個開朗的小孩, or someone who makes a room feel better或是能讓整個空間感覺變好的人, may be called 'a little sunbeam'可能會被稱作『a little sunbeam』（小陽光）。That use這種用法 is affectionate and mostly said to or about children是親暱的、主要是對小孩或講小孩時用 — said to an adult如果對大人說, it sounds either sweet or slightly sarcastic聽起來可能是甜蜜、也可能有點諷刺, depending on the face that says it要看說的人是什麼表情。

There is a well-known sarcastic version too: 'aren't you a ray of sunshine' means the opposite.

There is a well-known sarcastic version too還有一種很有名的諷刺版本: 'aren't you a ray of sunshine'『你還真是一道陽光呢』 means the opposite意思正好相反。

'Sunbeam' and 'ray of sunlight' mean almost the same thing, and either will do in nearly every sentence.

'Sunbeam' and 'ray of sunlight''Sunbeam'跟'ray of sunlight' mean almost the same thing意思幾乎一樣, and either will do in nearly every sentence幾乎任何句子裡兩個都能互換使用。