Extensions are not a required feature of the grammar and, thus, their syntax is not as well defined as the other constructs of the language.
扩展并不是文法必需的特性,因此它们的语法不象该语言的其它构造那样得到良好定义。
Honeycombing is usually subpleural and is characterized by well-defined walls. It is a ct feature of established pulmonary fibrosis.
蜂窝常位于胸膜下,有清楚的壁为其特征,它是一种可确定为肺纤维化的CT征象。
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