无标记项比有标记项的分布范围要大，使用频率也较高。
The unmarked items are more widely spread and enjoy a higher rate of utilization than the marked ones.
他们对无标记项的总体掌握程度显著高于有标记项，证明无标记项先于有标记项习得，标记对二语习得有重要影响。
On the whole, the learners did better in the unmarked meanings and functions than the marked ones, suggesting that the unmarked is easier to be learned.
UM l概要文件有三个关键项：构造型、标记值(特性)和约束。
A UML profile has three key items: stereotypes, tagged values (properties), and constraints.
UM l概要文件有三个关键项：构造型、标记值(特性)和约束。
A UML profile has three key items: stereotypes, tagged values (properties), and constraints.
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