X1 because, as you know or you should know, you can hold negative quantities of assets, that's called shorting them.

并不一定要是正数，We ' re, not, going, to, restrict, x 1, to, be, a, positive, number，你们应该了解，资产的数量可以为负，我们把这称为做空。

youdao

The results showed that in the granulation step. Quantities of binders and impeller rates exerted positive effects to tensile strength of tablets; grain size of raw material exerted negative effect;

结果表明，制粒一步中粘合剂用量及搅浆速度对抗张强度起正作用，原料粒度则起负作用，粘合剂加入速度对不同压力下压制的片剂抗张强度影响不同。

youdao

The large quantities of negative factors that exist in mass communication have seriously affected the teenager's growth.

媒介传播中大量存在的消极因素已经严重影响了青少年的健康成长。

youdao

If one is looking at this from a purely science and health perspective, the minute quantities of BPA found in can liners has no negative impact on human health.

FORBES: Campbell's Big Fat Green BPA Lie -- and the Sustainability Activists that Enabled It