1. 开沟：furrower 开沟铲 | furrowing 开沟 | furrowmeter 犁沟测量仪

2. 开沟,作沟：furrower 开沟器,起垄犁 | furrowing 开沟,作沟 | further crop 后作物

3. 槽膜形成 开沟：furrowed wing case ==> 沟纹翅鞘 | furrowing ==> 槽膜形成,开沟 | furrowing blade ==> 开沟铲

4. 槽膜形成：furringincrustant 水垢 | furrowing 槽膜形成 | furrowsmallplotoffarmland 畦