n. 操练；斜纹布；钻头（drill的复数）

n a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)

n similar to the mandrill but smaller and less brightly colored

n systematic training by multiple repetitions

n (military) the training of soldiers to march (as in ceremonial parades) or to perform the manual of arms

v make a hole, especially with a pointed power or hand tool

v train in the military, e.g., in the use of weapons

v learn by repetition

v teach by repetition

v undergo military training or do military exercises