Opcodes were given simple names, called mnemonics, which were followed by operands, to form instructions.

操作码被赋予简单的名称，称为助记符，后面跟着操作数，以形成指令。

So that is where we're calculating the age, and right below that you can see the type of error. In this case, we have a type error, and here's the message. Unsupported operand types for subtraction. Int and str.

这就是我们计算年龄的地方，就在下面你可以看到错误的类型。在这种情况下，我们有一个类型错误，这里是信息。不支持的操作数类型减法。 Int和str。