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

我田时看了矗立的。

Don’t stay under the arm of a derrick!

不要在起重机的吊臂下!

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的识别中起很好的效果。

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

请把三舱吊杆移里档，因为我的浮吊要外档卸重件。