Sindi
[地名] [爱沙尼亚、印度、乍得] 辛迪
🗣️ 情景例句
you can help me with dinner.
你就来帮我准备晚餐。
How long have you had this pain?
疼痛多久了？
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
测出回声间隔的时间，便可算出该处海洋的深度。