此字段是可选的。
This field is optional, as are all the others.
该区域是可选的，其他所有的区域也是可选择的。
Otherwise, this field is optional and can be enabled when case sensitive authorization check is required.
否则，该字段是可选的，并且在大小写敏感验证检查必须进行时可以被激活。
You made this element optional for backward compatibility, but you'll notice that the optionality of this field is a good idea anyway, because not all addresses have apartment Numbers.
您可以使这个元素为向后兼容的可选项，您会发现这个字段的这个可选性是一个很不错的主意，因为并不是所有的地址都有房间号码。
The label field in this extension is optional.
这个扩展中的标签域是可选择的。
This is followed by an optional Targets field where the user can define a list targets to be called by the build utility.
接下来是一个可选的Targets区域，用户可以在这个区域内定义一个构建工具所访问的列表对象。
You can also enter an optional back-reference field to create a link from the referenced record back to this field's record and can specify that the referenced record type is under security control.
而且建立好后，一般就不做改动了，所以是否好看、是否有冗余字段等都可以不在考虑的范围之内。
You can also enter an optional back-reference field to create a link from the referenced record back to this field's record and can specify that the referenced record type is under security control.
而且建立好后，一般就不做改动了，所以是否好看、是否有冗余字段等都可以不在考虑的范围之内。
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