Back focal length
[计] 后焦距
🧩 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;
focal
['fəukəl]
adj. 焦点的，有焦点的;集中在点上的;病灶的，病灶性的;
🗣️ 情景例句
What have you learned from jobs you have held?
你从以往的工作中学到什么？
You look very tried tonight.
今晚你看起来很疲倦。
When he was decorating his house, he had gotten the bedroom painted first.
他装修房子时，先刷了卧室。