更多vanning例句

1. As already pointed out, the object of vanning is to determine the proportion of black tin in the lode stuff.
2. The weighed portion of the ore is placed on the vanning shovel.
3. The vanning spade and shallow washing dish are the prototypes of this kind of ore-dressing machinery.
4. His first test was made with the ordinary "vanning shovel," his second with the aid of chemicals.