វគ្គជំនាញកុំព្យូទ័រ
ចំណេះដឹងទូទៅ
ម្ហូបអាហារ
កំប្លែង
ទស្សន៍ទាយ
small
medium
large
Holing
ENGLISH MEANING
noun
1.
Undercutting
in a
bed
of
coal
, in
order
to
bring
down
the
upper
mass
.