Given:

Human = Eating + Working + Recreating + Sleeping

(1)

Pig = Eating + Sleeping

(2)

Substitute (2) in (1),we obtain

Human = Pig + Working + Recreating

(3)

Rearrange (3), we obtain

Human - Recreating = Pig + Working

(4)

Managerial implication:

Humans without any recreation activities is like pigs working for their careers. 
(人缺了娛樂活動等同豬忙於爲人類打工 - 任人宰割。）

Future work:

Best wishes in the Year of Pigs.