(2)底部发酵(Bottom fermenting)：顾名思义，该啤酒酵母在底部发酵，发酵温度要求较低，酒精含量较低，味道偏酸，这类啤酒的代表就是国内常喝的窖藏啤酒。
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Bottom-fermenting yeast 下面发酵型酵母
Then it began to act like yeast used in slow-fermenting lagers, settling to the bottom of the tank but not going dormant.
然后它们开始像用于慢性发酵的储藏啤酒的酵母一样活动，深入酿造箱底部，却又不休眠。
Soon after that the yeast will drop to the bottom of the container and you will not see it working, but it will still be fermenting.
很快，酵母会沉到瓶底，这个时候你可能看不到酵母在工作，但这个时候酵母在发酵。
The tank is cylindrical with certain height, which can make fermenting liquor natural convection form top-down or bottom-up, is advantageous in temperature control.
罐身为圆筒形，具有相当高度，可以使发酵液形成自上而下或自下而上地自然对流，有利于麦汁发酵液温度控制。
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