他tā们men都dōu很hěn高gāo兴xīng
They are all very happy
Uses 都 to mean 'all' and 高兴 for 'happy'. The pattern is: subject + 都 + 很 + adjective.
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他們都很高興
Traditional

Contains the following characters:

他tā

he, him, his

们men

plural marker

都dōu

all, both

很hěn

very, quite

高gāo

tall, high

External Resources:

MDBG Dictionary
Wiktionary