Foresail
n. 前桅帆
✅ 同义词
📖 牛津释义
foresail
n
main sail on the front mast of a ship 前帆.
🗣️ 情景例句
Can I help with anything?
我能帮什么忙吗
May I take pictures?
我能照相吗？
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。