✔ 最佳答案
Adverbial clauses may be reduced by changing them into a participial phrase containing a gerund:-
The participial phrase containing a gerund is:-
=Using Phrenology hidden,
The main clause is:-
=scientists (s) were (v) to see ourselves(o)
= (s) + (v) + (o)
hide---hid---hidden =past participial used only adjectivally to qualify "phrenology" word as a noun
Why two verbs?-----were is the verb. "hidden" is the participial/+infinitive/+gerund/ classified according to function as/of a verb;Not a verb.
"phrenology"=the judging of a person's character,etc from an examination of the shape of his skull.