1.allow to 允许
例句:The wallets allow users to buy and sell bitcoins as well as spend them.
用户可以利用这样的钱包来购买、出售比特币，或者用比特币消费。
2.more than 超过
例句:He had notched up more than 25 victories worldwide.
他已赢得了超过25次国际级别赛事的胜利。
3.take off 取下
例句:Please get ready to warm up and take off.
准备发动和起飞。
4.learn to 学习
例句:Through pattern recognition, they can take complexity and learn to simplify it.
通过模式识别，他们能了解复杂性，学会简化它。
