The piece of string is short.

这根绳子是短的。

youdao

Tie the ends of the piece of string together.

把这段绳子的两头绑在一起。

youdao

Someone had played a trick on her, stretched a piece of string at the top of those steps.

有人对她搞恶作剧，在那些台阶的顶部拉了一根绳子。

《柯林斯英汉双解大词典》

To keep himself awake as he flew east during the long night, Post tied a piece of string to one finger.

VOA: special.2009.03.18

Early research involved a colleague lying in a deckchair in the night-time open air with a piece of string to measure the meteors, while he observed electromagnetic signals on a cathode-ray tube in a nearby hut.

ECONOMIST: Bernard Lovell | The

On this back side of the island, the West Maui Mountains exert themselves and push the road around like a piece of string, tight switchbacks yield to long swooping arcs that bring me deep into valleys and then shove me back out toward the coast.

CNN: Driving Maui's wild highway

For months, all we had to go on was the length of that mythical piece of string - until yesterday.

BBC: Crunching encounters - and numbers