If air, water, or land is polluted, it is dirty in a dangerous way — not a bit dusty, but unsafe to breathe, drink, or grow food in. We say a polluted river, polluted air, a polluted beach.

If air, water, or land is polluted如果空氣、水或土地被污染了， it is dirty in a dangerous way就是用一種危險的方式變髒—— not a bit dusty不是有點灰塵而已， but unsafe to breathe, drink, or grow food in而是呼吸、喝、或種食物都不安全。 We say a polluted river, polluted air, a polluted beach我們會說a polluted river（受污染的河流）、polluted air（受污染的空氣）、a polluted beach（受污染的海灘）。

The dirt usually comes from people: cars, factories, farms using too much chemical spray.

The dirt usually comes from people這種髒污通常來自人類： cars, factories, farms using too much chemical spray汽車、工廠、還有用太多化學噴劑的農場。

It is the -ed form of pollute, used as a describing word, so it tells you the state of the place, not who did it. News, science class, and everyday talk all use it this way.

It is the -ed form of pollute它是pollute的-ed形式， used as a describing word當形容詞用， so it tells you the state of the place, not who did it所以它告訴你的是那個地方的狀態，不是誰做的。 News, science class, and everyday talk all use it this way新聞、自然課、日常聊天都是這樣用它。

Though actually, people stretch it a little: “the city feels polluted” can just mean the air is heavy and grey, not that a scientist has measured it. It still points at the environment, not at a messy desk.

Though actually, people stretch it a little不過，人們也會把它用得寬一點： "the city feels polluted" can just mean the air is heavy and grey"the city feels polluted"可能只是說空氣感覺又悶又灰， not that a scientist has measured it不代表科學家真的測量過。 It still points at the environment但它指的仍然是環境， not at a messy desk不是一張亂七八糟的書桌。