Mathematics is not a spectator sport; to understand it, one must engage with it actively.
Live within your income and save so you can invest. Learn what you need to learn.
谷物种植的成功不仅仅以蒲式耳衡量，还要看我们土壤的健康状况。
要想有自信的态度，请学习不曾学过的知识。