Translation

• to talk about
• to mention
• (preposition) as for

Examples

• 说到天使，你就听到他们翅膀挥动的声音。
  Speak of angels and you hear their wings.
• 凯特总是闹钟响了还在睡。说到这， 你今天看到她了吗？
  Kate always sleeps through her alarm. Speaking of which, have you seen her yet today?
• 她只说到时候你们就知道了。
  All she said was that we would know when the time came.