因而，空格、句点和逗号都是有效的词界。
Hence, whitespace, a period, and a comma are each a valid word boundary.
构建的正则表达式要求在构建的表达式末尾有一个词界以确保此行为。
The regular expression built requires a word boundary at the end of the built expression to ensure this behavior.
毕竟，时装业是娱乐业的一个组成部分，而在娱乐界，阿谀奉承，夸大其词和虚伪做作并非罕见。
The fashion business is, after all, a part of the entertainment industry, where sycophancy, exaggeration and gushing insincerity are not unknown.
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