part of what the $6.1 billion U.S. egg industry bets will be its next big thing: climate-friendly eggs.
这部分整体是一个名词词组,作design的同位语。其中介词of后接一个嵌入式名词性关系分句作of的宾语,what=the thing which。
On a recent sunny day, 13,000 chickens roam over Larry Brown’s 40 windswept acres in Shiner, Texas. Some rest in the shade of a parked car. Others drink water with the cows. This all seems random, but it’s by design, part of what the $6.1 billion U.S. egg industry bets will be its next big thing: climate-friendly eggs.
1. 末尾的名词短语part of...是同位语还是状语?
2. 如果是同位语,是it的同位语,还是it's by design的同位语?
3. 如果是状语,是否等同于as part of...?