19、 Demands of beforehand commands expand so rapidly that several grand bands of them have already withstood their descenderce of both prices and manufactures.

翻譯：對預警命令的需求擴張得如此之快，以致于有幾個大品牌已能經受價格及產量的下跌。

英英詳解

demand
the need or desire that people have for particular goods and services:

beforehand
before something else happens or is done:

command
the control of a group of people or a situation

expand
to become larger in size, number, or amount, or to make something become larger (↪ expansion; ≠ contract):

rapidly
very quickly and in a very short time:

grand
1. big and very impressive (≠ humble):
2. aiming or intended to achieve something impressive:

band
group of musicians, especially a group that plays popular music

withstand
to be strong enough to remain unharmed by something such as great heat, cold, pressure etc (= resist, stand up to):

descenderce
這個詞應該是原文拼寫錯誤：descenderce...研究好久沒有找到比較有把握的正確拼法...
有這樣幾種推測：decender：這個詞米有找到英英解釋，在金山里面，是下降者，下降物的意思...
第二種推測：descendence：親親滬友ideo給出的解釋如下："此句中,descenderce應是descendence之筆誤,而descendence則是descendance的變體,作為名詞,其含義是"下降","子孫,后裔"的意思。"
第三種推測：descent：有下坡路的意思。（如果是這個詞，那么作者就是用了比喻嘍。 大家感興趣的可以討論并查證下~如果米有時間就忽略它吧。

manufacture
to use machines to make goods or materials, usually in large numbers or amounts: