butt-welded drill

例句：

1. 1. This butt-welded drill is very useful forcutting through concrete.
   这种但焊接钻头非常适用于切割混凝土。
2. 2. The butt-welded drill bit was the only toolthat could handle the heavy workload.
   这个但焊接钻头是处理重工作量的唯一工具。
3. 3. The butt-weldeddrill bit was used to remove the oldwall before installing the new one.
   这个但焊接钻头被用来在安装新墙之前拆除旧墙。