这样可以跨所有此类多语言字段实施语法限制。
These permit grammar restrictions to be enforced across all such multi-language fields.
当应用语法限制时，所有之后输入的有效表达式都可以使用任何一种语言表示。
When restrictions are applied, all valid expressions entered thereafter can be represented in either language.
首先介绍了早期的语法限制研究，接着总结了近年的研究动向，文章还讨论了语码转换结构研究中的几个焦点问题。
Directing attention first to early publications on grammatical constraints on code-switching, the review then takes a close look at how other issues central to the topic have been addressed.
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