Nghĩa chính
- Tín hiệu chặndanh từOne of the danger signals or safety signals which guide the movement of trains in a block system, often coupled with a switch so that opening or closing the switch also operates the signal.
Dạng từ (word form)
theo quy tắc (regular)- block signalDạng gốc (base form)
- block signalsSố nhiều (plural)