You've got to keep to the speed limit
你必須遵守限速規定。
You should always keep to the speed limit.
什么時候你都不得超過最高速度限制。
Keep to the nearside lane.
不要偏離左邊的車道。
Let's keep to the subject, or you'll get me too confused.
別跑題，否則你會把我搞糊涂的。
He had been unable to keep to his schedule.
他沒能遵循自己的計劃。