sub-span的意思|示意

When laid, the boards are positioned on the sub-floor extrusion, which runs across the span of the structure.

当铺设，电路板被放置在子层的挤压，它在整个结构的跨度运行。

If you later wanted part of the text in the slogan div to be graphical, and another part-say a sub-title or elaboration-to remain normal text, you could surround just the hidden text within a span.

如果您以后希望标语div内的部分文本是图像，并且另一部分—比如副标题或说明性文字—保持为普通文本，您可以仅将隐藏的文本放置在span内部。

Currently, in the actual production, MRP system is calculated on a time span through sub-total demand and net demand, and to express the demand for materials with the intermittent time series.

目前，在生产实际中，MRP系统是通过计算按时间分段的总需求和净需求，并以间断的时间序列来表达对物料的需求。