1) school commuting
上下学出行
2) upward flow-downward flow
上行-下行
3) over-entering and down-out
上进下出
1.
The double-circuits measure single phase electric energy meter is introduced,which structure is over-entering and down-out.
对上进下出双回路计量单相电能表进行介绍,描述其内部工作原理,并对该类表计的检测方法进行研究和探讨。
4) it would be up and down,
呈现出上上下下、
5) running upward & supplying downward
上行下给
1.
Having researched the current design method of fire fighting system with water tank which water running upward & supplying downward,the paper points out problems exist on the system mentioned above and provides improvement to solve the problem.
通过对现行上行下给单设水箱式室内消防供水系统设计方法的研究,指出其存在的问题,并提出了改进措施。
6) the uplink and downlink
上下行
1.
For the TD-SCDMA system,the uplink and downlink synchronous control technology is of special importance and a key technology of TD-SCDMA system.
对于TD-SCDMA系统而言,上下行同步控制技术显得尤其重要,是TD-SCDMA系统的关键技术之一。
补充资料：下学
1.谓学习人情事理的基本常识。 2.最差的学习。 3.向地位或学问不如自己的人请教。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条