order of precedence

• 优先级别

order of precedence的用法和样例：

例句

1. Each operator has a precedence level and associativity.
   每一个操作符都有自己的优先级别和结合性。
2. Use the priority level to determine the order in which you upgrade the nodes.
   使用优先级别确定节点的升级顺序。