A roll-on is a small bottle of liquid you rub under your arms so that sweat does not smell unpleasant. The top has a little ball; as you roll it on your skin, the ball turns and spreads a thin layer.

A roll-on is a small bottle of liquid you rub under your arms是一種你抹在腋下的小瓶液體，so that sweat does not smell unpleasant讓汗不會有難聞的味道。The top has a little ball瓶口有一顆小球；as you roll it on your skin當你在皮膚上滾動的時候，the ball turns and spreads a thin layer這顆球會轉動，塗上一層薄薄的液體。

It is one kind of underarm product, next to a spray and a stick. The word is everyday and a bit old-fashioned in advertising, but the bottle is still everywhere.

It is one kind of underarm product它是腋下用品的一種，next to a spray and a stick跟噴霧型和條狀的並列。The word is everyday and a bit old-fashioned in advertising這個詞很日常，在廣告裡聽起來有點老派，but the bottle is still everywhere但這種瓶子還是到處都是。

You can also hear roll-on as an adjective (roll-on deodorant). Though actually, in shipping, roll-on/roll-off means a ferry that cars drive onto — same shape of phrase, totally different thing — but the bottle is the meaning people meet first in a bathroom.

You can also hear roll-on as an adjective (roll-on deodorant)你也會聽到roll-on當形容詞用（roll-on deodorant）。Though actually不過其實，in shipping, roll-on/roll-off means a ferry that cars drive onto在航運業，roll-on/roll-off指的是車子可以直接開上去的渡輪——same shape of phrase, totally different thing詞的形狀一樣，意思卻完全不同——but the bottle is the meaning people meet first in a bathroom但人們在浴室裡最先遇到的意思，還是這瓶體香劑。