Drops to be very difficult是什么意思

Drops to be very difficult是什么意思 The operation proved to be very difficult这句中的prove是什么意思?它和Th Is it very difficult to be very famous? be willing to do sth difficult是什么意思? But some things can be very difficult是什么意思 sometimes it may be very difficult to distinguish ___right a it's very easy to be different ,but very difficult to be bet It si very difficult to oneself,It si more difficult to be a the operation proved to be very difficult.it proved to be __ be difficult for him to give up smoking是什么意思 your question is very difficult 后为什么加to answer而不是to be answe I'm （ ）enough to know it is going to be a very difficult sit