a.

1. 感情流露的
   a demonstrative person

   感情外露的人

2. 示范的
3. 论证的，证明的[（+of）]
   The exhibition is demonstrative of many problems in the city.

   这一展览说明了本市存在的许多问题。

4. 明确的，结论性的
5. 【语】指示的
   "This" is a demonstrative pronoun.

   “this”是指示代词。

n.

1. 【语】指示词[C]

adj.

1. tending to show affectionate or other feelings openly.
2. serving to demonstrate something.
3. Grammar  (of a determiner or pronoun) indicating the person or thing referred to (e.g. this, that, those).

n.