For example, you get the break at time zero.
例如说，你在时间0的时候就有了破裂。
That is the velocity at time zero, 0 and this is zero.
就是初始速度，而第二项是。
What is the acceleration in the y direction at time zero?
那y方向上,0时刻的加速度是多少？
And at time zero, when it is there, it has a velocity in that ellipse.
时间为0时，在轨道上有速度。
The second map shows Earth at the time of launch. That's time zero.
第二幅地图显示了没有时间显示的地球形成时期。
Time, start from zero. Story, but not at the end of the end.
时间，从零点开始。故事，却无法在终点结束。
Time, starting from zero. Story, but not at the end of the end.
时间，从零点开始。故事，却无法在终点结束。
There may be zero or multiple events at any time.
任何时候都可能有0个或多个事件。
When the object is here it is again zero at this moment in time.
而当物体移动到这里时，其速度也为0，对应着这个时刻。
So suppose here is the object at time t equals zero.
假设此处就是物体,在t=0时的位置。
Time, starting from zero. The story, but not at the end of the end.
时间，从零点开始。故事，却无法在终点结束。
I will count down three to zero, and then you can see that they reach the bottom almost at the same time.
我从3倒数到，你们能看到它们几乎，同时抵达底部。
The temperature will stay above zero in the day time, but at night it will fall below zero again.
白天气温将保持在零度以上，但在晚上又将降到零度以下。
Insignificant at this time. Always zero.
此时不重要。总为零。
Results: the recovery time at the zero signal point:.
结果：零信号点的恢复时间。
At that time, the slope of stress-strain curve of the rock is zero.
此时岩体应力—应变曲线的斜率为零。
At that time, the slope of stress-strain curve of the rock is zero.
此时岩体应力—应变曲线的斜率为零。
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