Made of three layers stuck together, or three strands twisted together. A 'ply' is one layer or one strand, so three-ply means there are three of them.

Made of three layers stuck together是由三層黏在一起做成的， or three strands twisted together或是三股撚在一起的。A 'ply' is one layer or one strand'ply' 指的是一層或一股， so three-ply means there are three of them所以 three-ply 就是有三層／三股。

You meet it in a few everyday places. Toilet paper and tissues are sold as one-ply, two-ply or three-ply, and the higher number means thicker and softer — this is the use you see most often on packaging in a supermarket.

You meet it in a few everyday places你會在幾個日常場合遇到這個字。Toilet paper and tissues are sold as one-ply, two-ply or three-ply衛生紙和面紙會分成 one-ply（一層）、two-ply（兩層）、three-ply（三層）在賣， and the higher number means thicker and softer數字越大就代表越厚越軟—— this is the use you see most often on packaging in a supermarket這是你在超市包裝上最常看到的用法。

Wood: three-ply plywood is three thin sheets of wood glued together, each with its grain running a different way, which makes the board much harder to bend or split than one thick sheet.

Wood說到木材： three-ply plywood is three thin sheets of wood glued togetherthree-ply plywood（三夾板）是三片薄木片黏在一起， each with its grain running a different way每片的木紋方向都不一樣， which makes the board much harder to bend or split than one thick sheet這讓這塊板子比單一厚木板更不容易彎曲或裂開。

Wool and rope: three-ply yarn is three thin strands twisted into one thicker strand, and knitters care about it because the ply number tells them how thick the finished knitting will be.

Wool and rope說到毛線和繩子： three-ply yarn is three thin strands twisted into one thicker strandthree-ply yarn（三股毛線）是三條細線撚成一條比較粗的線， and knitters care about it因為織毛衣的人很在意這個 because the ply number tells them how thick the finished knitting will be因為股數會告訴他們織出來的成品有多厚。

It is an adjective and it goes in front of the noun: three-ply tissue, three-ply wool. You would not normally say 'this tissue is three-ply' in conversation, though it is not wrong — the phrase lives mostly on labels and in shops.

It is an adjective這是個形容詞， and it goes in front of the noun放在名詞前面： three-ply tissue像 three-ply tissue（三層面紙）、 three-ply wool three-ply wool（三股毛線）。You would not normally say 'this tissue is three-ply' in conversation你在對話裡通常不會說 'this tissue is three-ply'， though it is not wrong雖然這樣講也沒錯—— the phrase lives mostly on labels and in shops這個說法大多出現在標籤和店裡。

The whole family works the same way: two-ply, four-ply, six-ply. Keep the hyphen.

The whole family works the same way整個這類詞都是一樣的用法： two-ply, four-ply, six-plytwo-ply（兩層）、four-ply（四層）、six-ply（六層）。Keep the hyphen記得中間要保留連字號。