系词，中文词汇之一，意思是逻辑上指一个命题的三部分之一，连系主词和宾词来表示肯定或否定。
他们不用“左”跟“右”这类关系词，而是用绝对的罗盘用语(“在你西南方向的腿上有一只蚂蚁”)，他们有难以置信的方向感。
They don't use relative terms like "left" and "right," but absolute compass terms (" There's an ant on your southwest leg "), and they have extraordinary orientation skills.
“是”从代词演变为断定系词，进而成为焦点标记，是语法界普遍接受的事实。
It is generally accepted that Shi evolved from a pronoun to a assertive copular and to a focus marker.
俄语和汉语中的一些空间关系词汇积极参与着向体范畴、时间范畴和情态范畴转化的语法化进程，这为语法化理论提供了有力的佐证。
In both Chinese and Russian, the words denoting spatial relations are involved in grammaticalization as regards aspect, time and modality, which provides evidence for the grammaticalization theory.
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