I, O, U. It will also, if there is a TH, make it vibrate - " vvvv" -- so it's going to help you when you're reading, with your pronunciation.

I, O, U. 如果有 TH， 它还会振动 - “vvvv”- 所以它会在你阅读时帮助你发音。

This is common when the sound before is voiced. The sound before here is V, vvvv, that is voiced, so he's making this a D sound: love duh-love duh-- and this is the schwa. Love to help you.

当前面的声音是浊音时， 这很常见。 之前的声音是 V，vvvv，这是浊音，所以他把这个变成 D 音：love duh-love duh-- 这是 schwa。喜欢帮助你。