grooved rail

• 槽轨,有槽导轨

grooved rail的用法和样例：

例句

1. Under the window rail there is a net curtain and a velvet curtain.
   窗帘轨下挂有沙帘和丝绒窗帘。
2. Ensure that the upper gate rail is horizontal before re-tinghtening the hand knobs.
   须先确定上闸门的门轨完全水平再重新拧紧手动旋钮。