请教各位whereby的用法

lemongggUID: 2422380

The name “transferware” comes from a nineteenth-century technique for which a pattern is engraved onto copper roll, printed on tissue paper, and transferred onto earthenware dishes.

A Comes from a nineteenth-century technique for which
+ p6 E5 ~7 j7 e4 c# O1 r2 E2 lB Comes from a nineteenth-century technique according to which
C Comes from a nineteenth-century technique whereby
8 Y+ _  `' Q# _3 SD Is a nineteenth-century technique wherein
E Means it is a nineteenth-century technique by which
. t  y: [$ E- |, \4 N
一直不太懂whereby的用法，这两天做到这道题，结果做错了。
& |; g* p; {( t( [% D& L有人已经发帖讨论了这题。。似乎是懂了，不过还是感觉有点别扭。。
谁能详细说说whereby的一些用法？或者再来几个例子。。谢谢了！

lemongggUID: 2422380

阿呀。。忘记下划线了。。

vannesssky310UID: 2391149

你何必新开贴阿?
% C" c' w6 q5 c我的帖子里面已经有了阿~~
也有了高人的解答了
7 V3 ^7 T0 L$ ?1 T5 Q: j6 a; lwhereby = by which