机长在英文中被称为 "captain"，这个词来源于拉丁语的"caput"，意思是"头"或"首领"。例句如下：

The captain of the ship is responsible for the safety of the passengers.（船的机长负责乘客的安全）

The captain of the football team is the one who leads the team onto the field. （足球队的机长是带领球队上场的人）

在一些情况下，机长也可以用 "pilot" 来表示，这个词来源于拉丁语的"pilota"，意思是"指引者"或"领航员"。例句如下：

The pilot of the plane is responsible for getting the passengers to their destination safely. （飞机的机长负责把乘客安全地送到目的地）

The pilot of the spaceship is the one who controls the spacecraft and makes sure it stays on course. （宇宙飞船的机长负责控制飞船并确保它保持航线）