ultra-fine particle是什么意思 ultra-fine particle怎么读
ultra-fine particle的用法和样例
- They pounded the grain into a fine powder.
他们把谷子碾成细粉。 - When the bead has cooled on the metal sheet transfer it to a mortar and grind to a fine powder.
当球珠已在金属板上冷却，把它转移到一个研钵里，研磨成细粉。
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