人为某样东西实际支付的成本至少是标价的两倍，因为买来后设置、学习、维护、修理，以及最后处置，也需要耗费精力、时间和钱。不是所有的实际成本都在价签上。实际成本是标价的2倍。
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.
将可持续发展与商业战略相结合是取得进展的唯一途径。
You have to believe in yourself when no one else does.
你的狗叫不了是因为我。
The greatest value of drone technology is that it can reach places that are difficult for humans to access.