There is no current flowing through any node(or antinode. ), but the current density changes periodically with time at other places.

没有能流通过节点（或腹点），但在其他各点，能流密度随时间作周期性变化。

youdao

There is no current flowing through any node(or antinode. ), but the current density changes periodically with time at other places.

没有能流通过节点（或腹点），但在其他各点，能流密度随时间作周期性变化。

youdao