two pln.对讲电话线twonum.二；两个two line ground双线接地two-axle gear双轴传动机构two-by-fouradj.长宽为二寸与四寸的；不大的；窄条的n.宽四寸厚二尺的木材two-door body双门车身two pipe system双管系统Two vote System单一选区两票制two-gang plow双组犁two phases flow两相流two-way trunk双向中继线two-man front二人突前的区域防守