Multilevel security problem
[计] 多级安全问题
🧩 词语组成解析
multilevel
['mʌltəˌlevəl]
n. 多级;多层次;
🗣️ 情景例句
Thank you so much.
太谢谢你了。
See you tomorrow.
明天见。
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。