纵横制交换机房

crossbar telephone exchange room

• unshaven
• unsigned
• unsinkable
• unskilled
• unskillful
• unsolved
• unspoken
• unstable
• unstoppable
• unstudied
• unsuccessful
• unsuccessful in
• unsuccessfully
• unsuitability
• unsuitable
• unsuitable for
• unsung
• unsure
• unsure about
• unsure of
• unsure of
• unsympathetic
• unsystematic
• unthinkable
• unthinkingly