Tickets were selling at twice their face value.是什么意思？

Tickets were selling at twice their face value.

这些票以其面值两倍的价钱售出。

Tickets

n. 票( ticket的名词复数 )，标签，交通违规的通知单，<美>候选人名单；

例句
The BBC Good Food Show is giving away free tickets in a competition. For details, see below.
英国广播公司“美食秀”正在派送比赛免费券，详情见下文。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

selling

n. 贩卖，出售；v. 卖，售，销( sell的现在分词 )，经销，推销，出卖；

例句
The selling broker is then required to assign a portion of the commission to the buyer broker...
卖方经纪人须随后将部分佣金分给买方经纪人。

at

prep. （表示位置）在，在（某时间或时刻），以，达， 向，朝；n. 阿特（老挝辅币单位，100 阿特 = 1 基普）；

例句
Prices start at £13.95 a metre for printed cotton...
印花棉布以每米13.95英镑的价格起售。

twice

adv. 两次，两倍，两遍；

例句
Although he was twice as old as us, he became the life and soul of the company.
虽然他的年纪是我们的两倍，但他却成为了公司的灵魂人物。

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

例句
Their permissiveness toward their children reflects the wild abandon of their own lives.
他们对孩子的放任折射出他们自身生活的放浪形骸。

face

n. 面容，表面，脸，方面；vt.& vi. 面对，面向…，正视，承认；vt. （感到不能）对付，（明知不好办而）交谈，必须对付（某情况），面临…；

例句
Graham hit him across the face with the gun.
格雷厄姆用枪击打他的脸部。

value

n. 价值，价格，意义，涵义，重要性，（邮票的）面

例句
Cheques can only be accepted up to the value guaranteed on the card...
支票的承兑金额不可高于卡上所担保的数额。