Grammars provide some constraints here, of course; but the study of selection among syntactic options falls within the fields of semantics, pragmatics, and register.
当然，语法会带来一些限制；不过，对句法选项的选择的研究属于语义学、语用论和术语范畴。
On the other hand, OVal's ease of use and wide selection of constraints make it a viable option for adding validation constraints to code with little effort.
从另一方面讲，OVal很容易使用，对约束条件也有很大的选择余地，若想要花少量力气就可向代码添加验证约束条件，它无疑是个上佳之选。
In our book we review a large and varied selection of non-environmental constraints on trait transmission.
在本书中我们回顾了多种多样非自然选择的性状遗传。
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