Angles less than 30 degrees require longer tanks and are less effective in removing air pockets.
2
她想起屋子前有一个大石头槽子,便对小姑娘说:“小红帽,把桶拿来。”
In front of the house was a great stone trough, so she said to the child, take the pail, red-cap.
3
从此样板可以判断槽子有无适当的过滤,“L”板的评价是相对的评价,因此不如“H”板重要。
This panel is done to determine whether or not the tank has proper filtration. The "l" rating is a relative rating and is therefore not as important as the "h" rating.