The underseal is a kind of waterproof material to coat the bottom of the car.
底封是一种涂在汽车底部的防水材料。
But the bottom line is this: Michael contains some very impressive new material.
至少可以说：《迈克尔》包含一些令人印象深刻的新材料。
If a lot of it is heavy material, it may precipitate to the bottom.
如果有许多是沉重的材料，它可沉淀到水底。
If a lot of it is heavy material, it may precipitate to the bottom.
如果有许多是沉重的材料，它可沉淀到水底。
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