重點句型
1. Their use was limited by laws, the first of which dates back to the fourteenth century.
面具的使用受到法律的限制，最早可追溯到14世紀。
2. If they broke the laws, they were put into prison for up to two years.
如果他們違犯法律，就要被判處長達兩年的監禁。
3. If the masks come off, the magic is lost.
如果面具摘掉了，魔力也就消失了。

句型探究
1. Their use was limited by laws, the first of which dates back to the fourteenth century.
面具的使用受到法律的限制，這最早可追溯到14世紀。
(1)該句中the first of which...是一個非限制性定語從句，修飾先行詞laws。
(2)date back to 相當于date from,意為“追溯到,始于”;常用于一般現在時,無被動語態。
Their friendship dates back to their childhood.
他們的友誼始于兒童時代。
2. If they broke the laws, they were put into prison for up to two years.
如果他們違犯法律，就要被判處長達兩年的監禁。
(1) put sb. into prison (prison前無冠詞)
=send sb. to prison 把某人送進監獄
be in prison 坐牢
(2) up to
①達到(數量,程度);至多有
I can take up to four people in my car.
我的汽車最多能坐4個人。
②直到
Up to now, he has been very quiet.
直到目前，他一直很安靜。