Resist the temptation to remove all of the black spots by hard scrubbing or by flexing the soft copper. 抵制诱惑，删除所有的黑点很难擦洗或伸缩软铜。
With his bow drill, the workman bores small cavities for brads of soft copper to be hammered in, binding the pieces. 他要用弓钻现在上面打几个小孔，然后软铜做成的曲头钉穿在里面好把碎片绑在一起。
