瑞铁的提示，不太容易理解~

我在瑞铁查到米兰的票的时候有个问题，因为我可能最后一天还要安排从米兰到威尼斯。这段话的意思是什么？Travel advice: EC 17 Zürich HB 11:09 - Bellinzona 13:23 - Lugano 13:47
Travel advice: Passengers travelling to Zug, Arth-Goldau, Bellinzona, Locarno (changing in Bellinzona) and Lugano are advised to take the ICN 10017 departing from Zurich HB at 11:01.
Passengers travelling to Italy should note that connections at Milano Centrale cannot be guaranteed. Please allow enough time to change trains.