Lagging is a special thick material wrapped around a water pipe, a tank, or a boiler so heat does not escape — or so frost does not get in.

Lagging保溫材 is a special thick material是一種特殊的厚材料， wrapped around a water pipe, a tank, or a boiler包在水管、水塔或鍋爐外面， so heat does not escape讓熱不會散失出去 — or so frost does not get in或是不讓霜凍跑進來。

In British English this is the ordinary word for that wrapping; you lag the pipes before winter. It may look like a fat soft sleeve, or like fibre and foil bound on with tape.

In British English在英式英文裡， this is the ordinary word for that wrapping;這是指這種包覆材料的普通說法； you lag the pipes before winter冬天前你會 lag（包覆）水管。It may look like a fat soft sleeve,它可能看起來像一個胖胖軟軟的套子， or like fibre and foil bound on with tape或是像用膠帶固定的纖維和鋁箔。

Though actually, American English more often says insulation, and lagging is also, in another life, the -ing form of lag meaning “falling behind” (lagging sales, a student who is lagging). This entry is only the pipe-cover meaning.

Though actually,不過實際上， American English美式英文 more often says insulation,比較常說 insulation（隔熱材）， and lagging is also, in another life,而 lagging 在另一個用法裡， the -ing form of lag是 lag 的 -ing 形式， meaning "falling behind"意思是「落後」 (lagging sales, a student who is lagging)（像 lagging sales 銷售落後，或落後的學生）。This entry這個詞條 is only the pipe-cover meaning只講管子包覆材這個意思。

The two ideas look the same on the page, which is messy, but the plumber’s lagging is a thing you can touch.

The two ideas這兩個意思 look the same on the page,寫出來看起來一樣， which is messy,有點容易搞混， but the plumber's lagging但水電工說的 lagging is a thing you can touch是一個摸得到的東西。