plural derricks
plural derricks
Learner's definition of DERRICK
[count]
1
: a tall machine with a long part like an arm that is used to move or lift heavy things especially on ships转臂起重机，吊臂起重机（尤用于装卸船）
2
: a tall tower that is built over an oil well and used to support and guide the tool that is used to dig the hole and get oil out of the ground（油井的）井架，钻塔