
signal
词源
源自拉丁语 'signum',意为‘标记’或‘符号’,后经古法语 'signal' 进入英语。
noun
❶ 信号,指用于传递信息或指示的物理现象,如光、声音或电波等,常用于交通、通信或技术领域。
“The traffic signal turned red, so we had to stop.”
(交通信号灯变红了,所以我们不得不停下来。)
“She gave a signal with her hand to indicate she was ready.”
(她用手势示意她已经准备好了。)
❶ 迹象,指某种情况或事件的征兆或暗示,常用于描述未来的可能性或趋势。
“Dark clouds are a signal of an approaching storm.”
(乌云是暴风雨即将来临的迹象。)
“Her smile was a signal that she agreed with the plan.”
(她的微笑表明她同意这个计划。)
verb
❶ 发出信号,指通过某种方式传递信息或指示,常用于动作或行为。
“The ship signaled for help with flashing lights.”
(那艘船用闪烁的灯光发出求救信号。)
“He signaled to the waiter to bring the bill.”
(他向服务员示意要结账。)
常见短语
signal to — 向某人或某物发出信号,通常用于表达意图或指示。
“He signaled to the driver to slow down.”
(他向司机示意减速。)
give a signal — 发出信号,通常用于启动或指示某种行动。
“The teacher gave a signal for the students to begin the test.”
(老师发出信号让学生们开始考试。)