例句與造句

1. Route identifiers for general trains are always 4 digits a numeric prefix from 6-7 followed by a 3-digit route number . 6001 6198 are used for the trains that run in more than one railway bureau, while 7001 7598 will be used for the trains that run in only one railway bureau.
2. It's difficult to find routing identifier in a sentence. 用routing identifier造句挺難的