Back-bone
分水岭；脊柱
🧩 词语组成解析
back
[bæk]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背书于;下赌注于;
vi. 后退;倒退;
adj. 背部的;后面的;以前的;拖欠的;
adv. 以前;向后地;
bone
[bon]
n. 骨头;尸骨;骨质物;有…样的骨头的;
vt. 挑鱼刺，剔骨头;剔去…的骨;
vi. 苦学;专心致志;
🗣️ 情景例句
I'm so busy that I don't get around to it.
我忙得找不出时间去做它。
After forty years teaching English he thinks it's time to call it a day.
他教英语四十年，认为该退休了。
He sat with his arms across the chest.
他双臂交叉于胸前的坐在那里。