As one o'clock approaches, the ball rises to the top of the stake and then drops exactly on the stroke of one.
The ball rises on the approach to one o'clock, and drops exactly at one o'clock.
mnli hypothesis: The ball rises on the approach to one o'clock, and drops exactly at one o'clock. premise: As one o'clock approaches, the ball rises to the top of the stake and then drops exactly on the stroke of one.