底封是一种涂在汽车底部的防水材料。

The underseal is a kind of waterproof material to coat the bottom of the car.

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新列在顶部拥有一个头单元，中部的一个数据单元，以及底部的一个底单元。

The new column has a header cell at the top, a data cell in the middle, and a footer cell at the bottom.

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二日图上最后一个底部是284，发生于4月27日，记录这个双底，这是买入位。

Note the last bottom on the 2-day chart on April 27 was 284, making this a double bottom and a buying level.

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