a new type of jet engine is being texted that could eventually propel aircraft anywhere in the world within two hours or help boost...
这个是正确答案里的一部分,想问一下that引导的是修饰engine的定从,中间插入了"is being texted"?这样可以吗?
这属于定语后置,或者说算是倒装。
正常语序:a new type of jet engine that could eventually propel aircraft anywhere in the world within two hours or help boost is being texted
修饰engine的that从句,太长了。如果将is being texted置于后面的话,有头重脚轻的感觉。