Sieur
<法> n.先生,阁下(旧时法国对男子的尊称)
🗣️ 情景例句
His studies advanced steadily.
他的学业不断进步。
Didn't I tell you before?
我不是告诉过你吗？
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）。