焦点对准，清晰

1. 焦点对准;清晰：in favour of 赞成,支持;有利于 | in focus 焦点对准;清晰 | in force (法律)有效的;大批地

2. 焦点对准：impurity 杂质 | in focus 焦点对准 | in parallel 并联

3. 准确封焦：imagestructure 影像结构 | in focus 准确封焦 | incandescent light 长明灯