A roll-out is the occasion, or the planned period, when a new product, service, or rule is made available for people to buy or use. A company rolls out a phone; a school rolls out a new app class by class.

A roll-out is是 a new product, service, or rule新產品、新服務或新規定 is made available for people to buy or use開放給大家買、給大家用的 the occasion那個場合、 or the planned period或那段排好的期間。 A company公司 rolls out a phone推出一支手機； a school學校 class by class一班一班地 rolls out a new app推行一個新 app。

The picture behind it is unrolling something so it can be seen and used, though actually nobody is rolling a physical thing along the floor.

The picture behind it它背後的畫面 is unrolling something是把一樣東西攤展開來， so it can be seen and used讓人看得到、用得到， though actually不過其實 nobody沒有人 is rolling a physical thing along the floor真的在地上滾什麼東西。

It belongs to business and news English and sounds a little more planned than a simple launch: a launch can be one big day, a roll-out can be slow and in stages. You will meet the hyphen (roll-out), the one-word form (rollout), and the verb (they rolled it out last May).

It belongs to它屬於 business and news English商業和新聞英文， than a simple launch比單純的 launch sounds a little more planned聽起來更有計畫： a launch can be「launch」可以是 one big day盛大的一天， a roll-out can be「roll-out」可以 slow and in stages慢慢來、分階段。 You will meet你會遇到 the hyphen (roll-out)連字號的寫法（roll-out）、 the one-word form (rollout)連成一個字的寫法（rollout）， and the verb還有動詞 (they rolled it out last May)（他們去年五月把它推出了）。