You might also allow for multiple phone Numbers, as in Listing 6.
您还可以允许使用多个电话号码，如清单6所示。
Note: The line Numbers in Listing 4 are for reference only.
注意：清单4中的行号仅仅是为了参考方便而给出的。
You can add two Numbers together, as shown in Listing 5.
可以把两个数字相加，参见清单5。
You can add two Numbers together, as shown in Listing 5.
可以把两个数字相加，参见清单5。
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