这部小说例证了19世纪的社会问题。
The novel ___exemplifies the social issues of the 19th century.
她的故事例证了移民在新国家的挣扎。
Her story ___exemplifies the struggles of immigrants in a new country.
这个实验例证了能量守恒原理。
This experiment ___exemplifies the principle of conservation of energy.