Air bubble in glass 玻璃有气泡
Occasionally, a bubble is not removed during refining, a sand grain refuses to melt, a tremor in the tin puts ripples into the glass ribbon.
"有时候，在提炼的过程中会出现这些情况：一个气泡没有被移除，一个砂粒没有熔化，（熔融的）锡的一次颤动把波纹带进了玻璃带中。
A bubble of glass sits close in front of the driver's face.
司机面前是一扇挡风玻璃。
The bubble is a flaw in the glass.
这个小气泡是这只玻璃杯的缺点。
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