1.melt down 熔化
A simple solution, then, was to melt down the crown, cast it into a cube and weigh it.
于是，最简单的办法是：将王冠熔化，铸成一个方块，称出它的重量。

2.the bust of ...的半身像
I've ever had time to sculpt a bust of my father and to burnish it.
我甚至花时间雕了一尊我父亲的半身像，并把它擦得锃亮。

3.without loss of 不损失
Vector images can be blown up to any size without loss of quality.
矢量图无论放大多少都不会损失图片质量。