例句與造句

1. Optional user facility
   任選用戶設(shè)施
2. International data transmission services and optional user facilities in public data networks and isdns
   公用數(shù)據(jù)網(wǎng)與isdn網(wǎng)的國際數(shù)據(jù)傳輸業(yè)務(wù)和任選用戶設(shè)施
3. It's difficult to find optional user facility in a sentence. 用optional user facility造句挺難的