half-round drill

例句：

1. 1.The engineer used a half-round drillto make the holes in the wood.
   工程师使用半圆钻头在木头上打孔。
2. 2. The carpenter needed ahalf-round drill to cut the woodenplanks.
   木匠需要一把半圆钻来切割木板材。
3. 3. The construction crew useda half-round drill to remove theold wall paneling.
   建筑工人用半圆钻移除旧的墙板。