Second, the feature seems at first glance to be simple, but in fact has a rather large "design surface" and would require adding a fair amount of new syntax to the language.

第二，这个功能第一眼看上去貌似简单，但实际上有一个十分广的“设计层面”，并且将需要增加许多新的语法。

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The first set has a whole lot of properties the second set lacks: it is in a language, has a syntax and grammar, says something.

第一组具有一整套属性，第二组缺少这样的属性：必得在一种语言（有句法，有语法）中，才能说某事。

youdao

The first pass scans the user's source language, checks the syntax, and draws up various tables. The second pass produces object modules, which are like a group of machine-code instructions.

第一遍扫视用户源语言，进行语法检查并建立各种表格，第二遍产生结果模块，它们十分类似一组机器代码指令。

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