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。