relais的翻译，读音
释义：
n. 继电器
n. A narrow space between the foot of the rampart and the
scarp of the ditch, serving to receive the earth that may crumble off
or be washed down, and prevent its falling into the ditch.
n. A narrow space between the foot of the rampart and the
scarp of the ditch, serving to receive the earth that may crumble off
or be washed down, and prevent its falling into the ditch.