verb · to tie or fasten with a cord, rope, or strap

请系好安全带。

verb, noun · Cantonese copula equivalent to 'to be' (is/am/are).

我系学生。

verb · to tie up or fasten with rope

他将马系在了树干上。

noun · an academic division within a university or college

他在中文系学习汉语。

verb · to connect or relate to

他始终心系祖国的发展。

verb · to be (used in formal or literary contexts)

该项技术系我司自主研发。

noun · a set of connected things or parts forming a complex whole

太阳系由八大行星组成。

verb · to fasten or do up buttons on clothing

他低头系衬衫的扣子。

verb · to take someone into custody or imprison

他不幸被系于狱中，无法脱身。

verb · to link or establish a connection between things

我们要努力维系这段珍贵的友谊。

verb · to be concerned or anxious about someone or something

他虽然身在异乡，但心里始终系着远方的亲人。