air bubble

1.The incorporation of air bubbles in the glass spoiled it.

玻璃含有, 使它质量降低。

2.The surface defect appeared mainly as air bubbles and ferroferric oxide drops which centred around the lower outer - field portion of the stoneware cup.

表观缺陷主要表现为釉和氧化铁粒,且其集中于杯体下部外侧面。