I don't know him well; I've only met him twice.
我跟他不熟悉，只见过两次面。
They go there twice a week/month/year .
他们每星期╱每月╱每年去那里两次。
a twice-monthly/yearly newsletter
半月╱半年刊的简讯
an area twice the size of Wales
两倍于威尔士大小的地区
Cats sleep twice as much as people.
猫睡觉的时间比人长一倍。
At 56 he's twice her age.
他 56 岁，年龄比她大一倍。
1.两次;两倍
1.two times
2.two times the amount or rate of something
1.two times the amount or rate of something
1.But as long and difficult as the process became, it was always twice as much fun and definitely worth our while.
但是，尽管这付出的过程是如此漫长且艰辛，不过回报总是有双倍的快乐，这一切都是值得的！
2.A mathematician said the chance for same six numbers coming up twice in a row was one in four million, but he said coincidences do happen.
一位数学家表示，开出同样的六位数号码的几率为四百万分之一，但是他说，确实有可能出现巧合。
3.In addition, strength training exercises are recommended at least twice a week.
此外，每周最好进行两次以上的力量训练的练习。
4.Figures from the RAC Foundation, a motoring lobby, suggest that only a fifth of the population use trains more than once or twice a week.
来自皇家汽车俱乐部（一个汽车团体）的数据表明，全国只有五分之一的人每周乘坐列车出行的次数多于一次或两次。
5.If he were any more stupid, he'd have to be watered twice a week.
如果他再笨点儿，就要一周给他浇两次水了。（呵呵，把他当植物来看了。）
6.My blood cries out for the vengeance of my people' blood. Which can only be repaid with at least twice as much blood.
我的血液在为我族人所英雄不能发送消息流的鲜血呼喊着复仇，血债必须加倍偿还。
7.After my hearing tests, the audiologist told me that the decibel level at which I am comfortable hearing is twice that of a normal person.
在听力测试完后，专家告诉我，我能轻松听到的音量值已经是常人的两倍。
8.I can't play squash twice a week: I'm not as young as I was, you know!
我不能一星期打两次壁球了，我的体力大不如前了，你要知道！
9.The results show that EPAL approved pallets are able to withhold up to 48 kilonewtons force, twice as good as the non-approved pallets.
结果表明，通过选择EPAL托盘能够隐瞒高达48千牛力量，两倍于非好批准的托盘。
10.Another advantage of an electronic ignition system can produce voltage, up to twice the voltage a conventional system can produce.
电子点火系统的另一个优点是能够产生电压，此电压可达常规系统所能产生电压的两倍。