Optical indicator
[机] 光学指示器
🧩 词语组成解析
indicator
['ɪndɪketɚ]
n. 指示器;[化]指示剂;指示者;
🗣️ 情景例句
Who was it?
谁来的电话
The problem has been bothering me for weeks.
那个问题已经困扰了我几个星期。
They trooped behind the first dancer, copying its movements.
它们成群结队跟在第一只跳舞的蜜蜂后面，模仿着它的动作。