Pain-killers are very useful in small amounts to bring your temperature down.小剂量的止痛药对于降低体温非常有用。The police are searching for his killers.警方正在搜捕杀害他的凶手。Giant-killers Yeovil became the most successful non-league club in hist...
Variational principles play an important role in the formulation of many problems of mathematical physics.变分原理现在许多数学物理的表述中起着重要作用.After studying differential calculus you will be able to solve these mathematical problems....