Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.

除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。

youdao

Retinal reposition depend on position, length and operation time of scleral rupture.

视网膜复位与巩膜裂伤的位置、长短及手术时间有关。

youdao

The jury found police restrained Mr Rigg in the prone position for eight minutes while he was being arrested, a length of time that "more than minimally" contributed to his death.

BBC: 'Significant risk' for mental health patients in custody

Alves had been kept at arm's length by the Newcastle defence, but he worked a dangerous position after 55 minutes, only to see his shot charged down by Jose Enrique.

BBC: Middlesbrough 0-0 Newcastle

Taking my words a step further, if the security has low volume, specify exactly what your trading strategy is, including the length of time you think you will need to sell the full position given average liquidity.

FORBES: Know When To Sell