demonstrate/ 'dεmənstreɪt /

1.vt.[+theory] 
(make clear) 表明

2.vt.[+skill] [ appliance] 
(show) 演示

3.vt.
(prove) 证实

4.vi.
to demonstrate (for/against sth) 示威(支持/反对某事)

to demonstrate that...
证实…
to demonstrate how to do sth
演示如何做某事