Facebook最近发表了许可链项目[Libra](https://learnblockchain.cn/docs/libra/docs/welcome-to-libra/)，其中的最大亮点是Move语言。 下面我们从技术视角解读一下“Move: A Language With Programmable Resources”这篇白皮书，供大家参考。
为了便于理解，我...
## where is external call
```solidity
msg.sender.call(hex"")
```
```js
UniswapExchangeLiks(exchange).sync();
validate the address
```
```js
ERC20like(token).decimals();
```
## can the call be hooked
is there a way for an attacker to gain control of your execution
```
contra...