单词：ultra-fine
ultra-fine的用法和样例：
例句
- Fine grain size for the smaller contact area.接触面积小时用细的粒度。
- The beads were strung on very fine nylon.珠子被串在十分细的尼龙丝上。
词汇搭配
- ultra fine resolution low energy collimator超精细分辨率低能准直...
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英文语法词汇