In mathematics, a negative sign indicates that a number is less than zero.

在数学中，负号表示一个数小于零。

The formation of negative ions from these elements is difficult but to electron affinity of these negative ions is near to or less than zero.

这些负离子对应元素的电子亲合势大部分接近或小于零，负离子难以形成。

Its incremental cash flow is less than zero and so is the aggregate cash flow arising from the operational activities, which may cause the payment difficult.

公司现金流量净增加额为负，且经营性活动所产生的现金流量净额为负，可能出现支付困难。