Focal length
[计] 焦距\\n[化] 焦距
📖 牛津释义
focal length
(also focal distance), distance between the centre of a mirror or a lens and its focus 焦距.
🧩 词语组成解析
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
I ventured to correct the teacher's mistake.
我鼓起勇气去纠正老师的错误。
What is this?
这是什么？
Right from the start there was trouble with the Hubble.
从最开始哈勃望远镜就有问题。