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

请系好安全带。

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。