It could be positive or negative or complex, but it's just an ordinary number.

它可以是正数,负数或者复数,但它仍然只是一个普通的数

耶鲁公开课 - 基础物理课程节选

Complex systems such as climate and the financial markets have both positive and negative feedback.

FORBES: Chaos Theory, Financial Markets, and Global Weirding

Promotion for reducinng the negative effects caused by anthropic pressures on the conservation capacity of the units that form the complex of natural sites of biodiversity protection and conservation.

UNESCO: Consolidation of World Heritage Natural Sites in Brazil