单词：powder pattern
powder pattern的用法和样例：
例句
- Such observation could not wash out the interference pattern.这样的观察当然不可能消除掉干涉图样。
- The cleaned slide is dipped in deionized water and the drying pattern is observed.把已洗干净的载片侵入去离子水中然后观察其干燥的图样。
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