I'm about to tee off and then my phone rings.

我正要开球，然后我的电话响了。

You're supposed to tee off at your designated time.

你应该在订好的时间开始。

" we're gonna tee off at dawn, " we're gonna tee of at seven o'clock.

“我们将在黎明时开球，”我们将在七点钟开球。