Laff
abbr. launcher air filtration facility 发射器空气过滤设备
🗣️ 情景例句
He is with someone right now. Would you hold?
他现在在会客。你可以稍等吗？
A hot bath makes all the difference in the morning.
上午洗个热水澡能让人精神振奋。
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。