Watch-alarm
值班报警
🧩 词语组成解析
watch
[wɔtʃ]
vt. 注视，注意;看守，监视;守候（机会等）;密切注意;
n. 表;值夜，值班;看守，监视;值班人员;
vi. 观看;注视;守候;看守;
🗣️ 情景例句
The Thanksgiving Day parade is always such great fun.
感恩节的游行总是如此有趣。
The houses downtown are very expensive.
市区的房子很贵。
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。