Because it doesn't make sense to allow an age of, say, -2, you'll probably want to add some validation to the field.

因为将年龄设置为（比如说）-2是无意义的，所以可能要对这个字段添加一些验证。

youdao

Once you have the age field sorted out, you might want to specify length restrictions on the first-name field. You could code this validation as follows.

完成年龄字段后，可能希望指定对名字字段的长度加以限制。

youdao