The energy captured by space-basedphotovoltaic arrays would be converted into microwaves for transmissionto Earth, where it would be transformed into direct-current electricity.
空间光电池阵列所收集到的电力将在转换成微波后发射到地球，再在地面上转换成直流电。
2
Some kinds of batteries can be recharged by connecting them to a source of directcurrent.
有些型号的电池在接入直流电源时就能充电。
《柯林斯英汉双解大词典》
3
The polarographic behavior of iodoacetic acid has been studied by using single sweep polarography, directcurrent polarography and cyclic voltammetry.