Chlorine is a chemical element; its symbol is Cl. As a free element it is a greenish-yellow gas with a strong, sharp smell, and it is poisonous if you breathe much of it.

chlorine is a chemical elementchlorine(氯)是一種化學元素; its symbol is Cl符號是Cl。as a free element作為單質存在時, it is a greenish-yellow gas with a strong, sharp smell它是一種帶有強烈刺鼻氣味的黃綠色氣體, and it is poisonous if you breathe much of it吸入太多的話會中毒。

Cities put a little chlorine into tap water and swimming pools because it kills germs so well. Stronger chlorine chemicals sit in household bleach.

cities put a little chlorine into tap water and swimming pools城市會在自來水和游泳池裡加一點氯 because it kills germs so well因為它殺菌效果很好。stronger chlorine chemicals sit in household bleach更強的氯化學物質存在於家用漂白水裡。

Humphry Davy named it in 1810 from a Greek word for pale green, because of the colour of the gas.

Humphry Davy named it in 1810Humphry Davy(漢弗里‧戴維)在1810年幫它命名 from a Greek word for pale green用一個意思是『淡綠色』的希臘字, because of the colour of the gas因為這種氣體就是那個顏色。

Though actually, the heavy smell people notice at a busy pool is often not pure chlorine. It is probably other chemicals made when chlorine meets sweat and urine — so a well-run pool can smell less, not more. And bleach in a bottle is not chlorine gas; it is usually a chlorine compound in water, and mixing it with acid or ammonia is dangerous.

though actually不過其實, the heavy smell people notice at a busy pool is often not pure chlorine大家在人多的游泳池聞到的那種濃烈氣味,通常不是純氯。it is probably other chemicals made when chlorine meets sweat and urine那很可能是氯碰到汗水和尿液後產生的其他化學物質—— so a well-run pool can smell less, not more所以管理得好的泳池味道應該比較淡,不是比較重。and bleach in a bottle is not chlorine gas而且瓶裝的漂白水不是氯氣; it is usually a chlorine compound in water它通常是溶在水裡的氯化合物, and mixing it with acid or ammonia is dangerous跟酸或氨混在一起會很危險。

Chlorine the element, a chloride (chlorine joined to something else), and chloroform are related words, not the same stuff.

chlorine the element元素氯(chlorine), a chloride (chlorine joined to something else)chloride(氯化物,指氯跟其他東西結合後的產物), and chloroform還有chloroform(氯仿) are related words, not the same stuff這幾個是相關但不同的東西,不是同一種物質。