proper name, verb, place name, directional · used in transliterations to represent the sound 'si', especially in foreign names

俄罗斯是一个国土辽阔的国家。

pronoun · demonstrative pronoun indicating a person, thing, or place mentioned or present

他出生在这里，并长于斯，对这片土地有深厚的感情。

place name · Slovakia or Slovak (often used as an abbreviation or in transliterated names like Czechoslovakia)

捷克斯洛伐克在1993年分裂为两个国家。