Describing a part that you fix into place by pressing it until it clicks, and take off again just as easily — no screws, no glue, no tools.

Describing a part形容一個零件 that you fix into place by pressing it until it clicks用壓的方式壓進去、喀一聲就固定好，and也 take off again just as easily一樣輕鬆就能拆下來——no screws, no glue, no tools不用螺絲、不用膠、不用工具。

Snap-on wheels, a snap-on lid, a snap-on phone case, snap-on lens for a camera. The word tells you two things at once: how it goes on (a quick push and a click) and that it is meant to come off again, so you can swap it, clean it, or replace it. That is why it appears so often in adverts and instruction manuals — it is a selling point that says easy.

Snap-on wheelssnap-on wheels（卡扣式輪子）、a snap-on lid卡扣式蓋子、a snap-on phone case卡扣式手機殼、snap-on lens for a camera相機用的卡扣式鏡頭。The word這個字 tells you two things at once同時告訴你兩件事：how it goes on (a quick push and a click)怎麼裝上去（快速一壓、喀一聲），and而且 that it is meant to come off again是設計成可以再拆下來，so這樣 you can swap it, clean it, or replace it你就能替換、清洗、或更換它。That is why這就是為什麼 it appears so often in adverts and instruction manuals它常常出現在廣告和說明書裡——it is a selling point that says easy這是在強調「方便」的賣點。

It goes before a noun and stays the same: a snap-on cover, two snap-on covers. As a verb the words separate: the lid snaps on.

It它 goes before a noun放在名詞前面 and stays the same而且形式不變：a snap-on cover一個snap-on cover，two snap-on covers兩個snap-on covers。As a verb當動詞用時 the words separate這兩個字會分開：the lid snaps on蓋子snap on（喀一聲扣上）。

Related words follow the same idea: snap-together, clip-on, press-fit. The idea comes straight from snap, the sound of that small sharp click, which is also why we snap our fingers and why a bag has a snap fastener.

Related words相關的字 follow the same idea也是同樣的概念：snap-together, clip-on, press-fitsnap-together、clip-on、press-fit。The idea comes straight from snap這個概念就是直接來自snap這個字，the sound of that small sharp click那種喀的一聲短促的聲音，which is also why而這也是為什麼 we snap our fingers我們會snap（打）手指、and和 why a bag has a snap fastener為什麼包包會有個snap fastener（按扣）。

(Snap-on is also a well-known American tool brand; that is a name, not this meaning.)

(Snap-on Snap-on is also a well-known American tool brand也是一個知名的美國工具品牌；that is a name, not this meaning那是個名字，不是這個意思。)