例句與造句

1. Gin pole derrick ( also known as standing derrick or pole derrick ) is a derrick without a boom with single tower or mast supported by 4 guy wires ( two side guys, fore guy and rear guy ).
2. Gin pole derrick ( also known as standing derrick or pole derrick ) is a derrick without a boom with single tower or mast supported by 4 guy wires ( two side guys, fore guy and rear guy ).
3. It's difficult to find pole derrick in a sentence. 用pole derrick造句挺難的