一个技术难题是气穴现象，一旦发生气穴现象，位于旋转螺旋桨叶后方的低压会产生气泡。

One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles.

youdao

时间是绝对因素：如果时间过长，硅的变化会过大，并产生气泡。

Timing is everything: if the treatment lasts too long, the silicon changes too much and blistering occurs.

youdao

相信我，所有这些等待都是值得的，因为姜酒放于冰箱期间，酵母会让它产生气泡，还记得我们在此前放入的酵母吗？

Now trust me, all this waiting is worth while, cause while your ginger beer is in the fridge, the yeast is making it 14 fizzy. Remember that yeast we put in earlier on?

youdao

相信我，所有这些等待都是值得的，因为姜酒放于冰箱期间，酵母会让它产生气泡，还记得我们在此前放入的酵母吗？

Now trust me, all this waiting is worth while, cause while your ginger beer is in the fridge, the yeast is making it 14 fizzy. Remember that yeast we put in earlier on?

youdao