OG th 紫色 22 求教！

singdeath

如果用should acquire ，意思就是Increased crossbreeding because certain characteristics should be acquired. acquire certain characteristic 是表示目的，而不是原因。increase crossbreeding是为了acquire certain characteristics。

而且should的意思是义务，必须，而这里是表示可以通过某个方式达到某个目的，而不是这个方式有义务或必须达到这个目的。

另外，我觉得如果真要用partly because的话，可以改写成partly because they expect to acquire certain characteristics...或者partly because they can acquire certain characteristics

纯粹是个人理解

reallingling

其实e中省略了partly(because crossbreeding is said ) to aquire characteristics in their steers;前置的这种省略很少，但是有

jeffyofbupt

呵呵，我个人觉得 12 层 同学的解释让人信服，比较容易理解！

以前确实没有见着过这样的前项省略，这个题中长见识啦！

谢谢各位同学！