We can only speculate at the core composition of mercury, but it has a very high density for its radius so it is likely to have a large metallic core accounting for most of its mass.
我们只能推测在汞的核心成分，但它有它的半径密度非常高，所以很可能有一个大的金属的群众最核心的会计。
The right-truncated cone is firstly adopted to approximate metallic wire target with a curvilinear axis and variable radius.
首先引入直截锥体单元来模拟金属线状目标，可对横截面连续变化的导线做精确近似；
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