Backward channel
[计] 反向信道
🧩 词语组成解析
🗣️ 情景例句
I need to be in the top percentage of my class to study abroad.
为出国留学，我的成绩必须在班里名列前茅。
Would you help me lift this heavy box?
你将帮助我提起这个重盒子吗？
The lake was not a natural one, but a man-made reservoir.
这不是一个天然湖泊，是一座人工修建的水库。