A grain of gravel can be disliked by idle people or praised as a building structure.
A person can spend his life in a muddle, or he can start a great career and create brilliance.
A scholar can disappear in obscurity in the crowd or stand on the Nobel podium.
A nurse can work in the ward day and night, and she can also take care of thousands of patients in Qian Qian.
A teacher can work hard in chalk dust or be full of peaches and plums.