Question

It signals a change(in what was,until now)been a……的语法结构？

Answer 1

你打错了~。。。。应该是

It signals a change in what has, until now, been a key element of scientific endeavor~

抽出主要部分： it signals a change~ 这预示着一个变化~

其他是发散部分~

进一步发散~

It signals a change in wh...