一颗愉快的心像药一样的好
I don't think so,I think a merry heart is better than a medicine.
Yes it sure does and it makes a cheerful countenance but a broken spirit dries the bones.
Truthfully,I have never thought of a "merry heart" but I agree that a good laugh or something nice happening to you makes you feel better.我想说的是用英文解释这句话，然后再举列子It means if you keep happy, then you will keep healthy,Indeed, laughter is a balm to the weary spirit.