The descender value is measured in points.

这个值的单位是磅。

Alright I'll stay here keep an eye on the descender.

好的，我留在上面，帮你们看着点。

Including Rescue rope, karabiners, Descender, Sling, Rope protectors, Red rescue bag.

包括救援绳，安全钩，下降器，吊带，绳。

Also, it is the distance between the ascender line and the descender line of a typeface design.

亦即是字面设计上的上升笔划线到下降笔划线间的距离。

For example, if the longest descender extends 2 points below the baseline, this method returns -2.0.

举个例子。如果最长的那个下沉字元在基线下2磅，那么这个方法返回- 2。