translation.en: We spend lots of time learning about calculation, but let's not forget about application, including, perhaps, the most important application of all, learning how to think.
translation.zh: 我们花了很多时间去学习算术, 但是请不要忘记数学在实际中的应用, 包括可能是最重要的一种应用形式, 学会如何思考.