focal

柯林斯詞典

1. ADJ Focal is used to describe something that relates to the point where a number of rays or lines meet. 焦點的[ADJ n]
...the focal plane of the telescope. ...望遠鏡的焦平面。
2. ADJ Focal is used to describe something that is very important. 非常重要的[ADJ n]
...one of the focal centres of the Far East. ...遠東的中心地區(qū)之一。