Actual lower bound
[计] 实际下界, 实在下界
🧩 词语组成解析
lower
['ləuə]
adj. 下方的;在底部的;较低级的;
v. 降低;减少;缩小;
bound
[baʊnd]
vi. 跳，弹跳;限制;接壤;
vt. 给…划界，限制;使弹回，使跳跃;束缚;
n. 界限，限制;跃起;（球等的）反跳;
adj. 用带子绑住的;有义务的;装订的，有封面的;[化，物]结合的;
bound(to bind)→装订好的；必定；决心的；被束缚的
🗣️ 情景例句
Then, in college, I became good at it.
然后， 在大学， 我变得很精于数学。
I would like to talk to Mr. Liu.
我想请刘先生来听电话。
The porter went to fetch one and arrive back with the station master,
搬运工跑回去取时刻表，同时请来了站长。