单词：focal surface
focal surface的用法和样例：
例句
- The key places for such manipulation are the back focal plane of the objective and the front focal plane of the substage condenser.最关键的地方为物镜的后焦面和载物台下聚光镜的前焦面。
- The encircled-power method is introduced to define the beam width and real focal plane of focused sinh-Gaussian beams, thus their focal shift can be determined.使用环围功率法定义束宽和实际焦面，由此可以决定聚焦双曲正弦高斯光束的焦移。
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