timing in econometric model

例句：

1. 1. Timing is everything in this business.
   在这个生意中，时机至关重要。
2. 2. The timingof the meeting was perfect.
   会议的时机恰到好处。
3. 3. He decided to take action at theright timing.
   他决定在正确的时机采取行动。