An older man with bushy eyebrows is speaking into a microphone.
A man is giving a lecture to an audience.
An older man speaking into a microphone is not necessarily giving a lecture and is not necessarily speaking  to an audience.
exists e1 s1 s2 x1 x2 x3.(into(e1,x3) & n_microphone(x3) & Actor(e1,x1) & v_speak(e1) & with(x1,x2) & n_eyebrow(x2) & a_bushy(s2) & Theme(s2,x2) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(to(e1,x3) & n_audience(x3) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_lecture(x2) & n_man(x1))