1.折,摺;捏起(拳头)
2.(旅客等)同住一室
3.弯着身子
1.if two people double up, they share something, especially a bedroom
1.You can double up on as many days as you want. Just spend at least two weeks at each stage before adding more miles.
你可以随心所欲地增加你倍加训练的天数，但在增加里程前，每一阶段至少要保持两周的时间。
2.Do not take a double dose of this medication. Do not double up the dose to catch up.
而就文中所介绍的药物，应当是“切勿一次服用两倍剂量”。
3.If she had to double up with one of them, she would double up with Harry because logically that makes more sense.
如果她非得与人共乘一把扫帚的话她会和哈利，因为逻辑上更合理。
4.For some kids, they might have to double-up on work the next day so they can do homework.
有些孩子可以需要合力完成第二天的某项工作，这样他们才有时间做家庭作业。
5.Jeff: If you were smart, you would celebrate both new years so you could double up on the number of parties.
杰夫：如果你聪明你就会庆祝两个新年，这样你就可以参加双倍的派对！
6.Given the current state of the economy, many people are choosing to double up with a roommate to help share expenses.
考虑到现在的经济形势，很多人都选择找一个室友来分摊房租。
7.Despite a lack of obvious body parts that can double up as a decent pair of wings, some snakes, too, can glide for remarkable distances.
尽管身体明显缺少一部分，如一对能够拍打且适于滑行的翅膀，一些蛇也能飞行很远。
8.Chen double up with laughter as we attempted collectively to say 'thank you' and 'good-bye' in Chinese.
我们甚至还让陈太太开怀大笑起来，我们尝试一起用中文说“谢谢”和“再见”。
9.Under Lisbon, there will also be a quasi-foreign minister who will double up as the external-affairs commissioner.
在里斯本条约的框架下，还会出现一个类似外交部长的职务，该部长将比外交事务专员拥有更大的权力。
10.Many people, especially in the U. K. , have been programmed by recent experience to think their homes double up as golden geese.
近期的经验让许多人（尤其是英国人）以为自己的住房会像摇钱树一样不断升值。