機器
alloy
background
bit
bits
bore
borer
boring
clear
coal
coalmine
cone
construction
cutter
cutting
damaged
drill
equipment
exploration
gas
hard
head
historic
hole
industrial
industry
instrument
iron
isolated
mechanical
metal
milling
mine
mining
oil
old
part
rig
rust
scooter
section
seismic
skirt
teeth
tool
triplet
tunnel
turning
white