Terms containing two-position element

Subject	English	Chinese
railw.	AC two element two position relay	交流二元二位继电器
tech.	alternating current track circuit with two element two position relay	交流二元二位轨道电路
tech.	alternating current two element two position relay	交流二元二位继电器
el.	two-position element	双位元件
auto.ctrl.	two-position element	两位元件