If something is flammable, it catches fire easily — paper, petrol, dry wood, some plastics. Warning signs on bottles and lorries use this word so people keep flames and sparks away.

If something is flammable如果某樣東西是flammable（易燃的） it catches fire easily它就很容易著火 — paper, petrol, dry wood, some plastics——像紙、汽油、乾木頭，還有一些塑膠。Warning signs on bottles and lorries use this word瓶子和貨車上的警示標誌會用這個字 so people keep flames and sparks away好讓大家把火焰和火花隔開。

Here is the messy truth that even native speakers trip on: the older word inflammable means the same thing, not the opposite. The in- at the start was like into flame, but it looks like the in- that means not, as in invisible. So writers and safety people started using flammable on purpose, cut from inflammable, to stop someone thinking inflammable meant will not burn.

Here is the messy truth that even native speakers trip on這裡有個連母語人士都會搞混的麻煩真相 : the older word inflammable means the same thing, not the opposite：比較舊的字inflammable意思是一樣的，不是相反。The in- at the start was like into flame開頭的in-原本的意思像是『進入火焰』 but it looks like the in- that means not, as in invisible但它看起來很像表示『不』的那個in-，就像invisible（看不見）裡的那個。So writers and safety people started using flammable on purpose所以作家和安全人員故意開始用flammable cut from inflammable是從inflammable裡切掉的 to stop someone thinking inflammable meant will not burn好避免有人以為inflammable是『不會燃燒』的意思。

Non-flammable is the real opposite. You will still see inflammable on older labels and in careful British writing. In everyday speech, flammable is the clear, modern choice.

Non-flammable is the real oppositeNon-flammable（不易燃）才是真正的反義詞。You will still see inflammable on older labels and in careful British writing你還是會在比較舊的標籤上，還有講究的英式寫作裡看到inflammable。In everyday speech在日常口語裡 flammable is the clear, modern choiceflammable是清楚、現代的選擇。