The system is always aware of the current date and time, so it's a trivial thing for the computer to subtract a birth date from the current date to get an age value.

系统通常只意识到当前的日期和时间，所以让计算机从当前日期中提取出出生日期来获得年龄值是一件微不足道的事。

So I subtract half of the expected child, of course, burning sense of time less than half the recipe.

所以我就减去了一半的料儿，当然啦，烧的时间也比食谱上讲的少了一半。

If you really want to recalculate the gravitational acceleration using our data, you should really subtract the two milliseconds from the time.

如果你想用我们的，数据重新计算重力加速度，你需要从这个，时间里减去2毫秒。