Therefore, we must do is to have a lower limit.

因此，我们必须做的，是有一个下限。

But in any case, "standard" will be a lower limit, no way.

但无论如何，“标准”将是一个下限，没有办法。

During the day the lower limit is about 8 to 10 times the aperture.

白天时的下限是孔径的8到10倍。

And it doesn't work out specific provision on the lower limit.

而没有对下限做出具体的规定。

After the piston reaches BDC, or the lower limit of its travel, it begins to move upward.

在活塞到达下止点时，或者是活塞下限时，活塞开始向上运动。