What you actually pay for something is at least twice the listed price because of the energy， time， money needed to set it up， learn， maintain， repair， and dispose of at the end. Not all prices appear on labels. Actual costs are 2x listed prices.

What a caterpillar calls the end of the worldwe call a butterfly.

"The past is always listening, waiting for us to turn our backs so it can whisper in our ears."

永远不要停止学习，这个行业一直在发展。