看《经济学人》遇到这样一个句子“The authorities are keen to be seen to be cracking down hard.”请问这个句子和“The authorities are keen to be cracking down hard.”有何区别?如果有,“to be seen”在句中作何理解?可以帮忙列举类似的用法吗?
American cooking often mixes things from around the
world to make something completely new.请问句中的from around the world是什么用法?from和around都是介词吗?还是
around 是副词?