爱使人快乐,却常伤害人.

Love can make you happy but often it hurts.

吃冰淇淋确实能够使人快乐！

Eating ice cream really does make you happy.

美德使人快乐。

Virtue leads to happiness.

液汁能给人快乐，也能使人遭受可怕的痛苦。

The sap gave great pleasure but also caused terrible suffering.

丘脑控制意识、睡眠、感觉，多巴胺是脑中分泌的使人快乐的化学物质。是吗？

Neil: The thalamus controls consciousness, sleep and the senses and dopamine is the feel-good chemical in the brain. Is that right?