derricks

Steel derricks rose to meet our eyes as we drew nearer to the oil fields.

我们快到田时看到了矗立。

Don’t stay under the arm of a derrick!

要在起重机吊臂下!

Utilized this method to segmentalize the image of oil derrick arc welding robot welding line gets up the good effect.

将该方法运用于石弧焊机器人焊缝图象识别中起到效果。

Please swing the derricks at Hatch No.3 to the shoreside because our floating crane will come alongside to unload the heavy lifts.

请把三舱吊杆移到里档，因为我们浮吊要到外档卸重件。