黑色塑料线圈,在末端有J 字形 的勾.It is black plastic coil with J - Hook on one end.卫生间通风统一由排风扇接出,在末端安装止回阀.Bathroom ventilation fans to unification by a row, the check valve installed in the terminal.是机械操作在末端,在紧固件表面或肩部.Facing . Facing ...

“在末端”的英语可以翻译为：endways，terminally ...