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水槽中不可有上升的气泡。
There must be no air bubbles rising in the water bath.
youdao
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气泡在熔体中的上升速度很小，可以忽略。
It can be neglected that rise velocity of gas bubble is very small in melt.
youdao
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气泡在熔体中的上升速度很小，可以忽略。
It can be neglected that rise velocity of gas bubble is very small in melt.
youdao