but it can be very useful to understand中to understand是什么成分?

but it can be very useful to understand中to understand是什么成分? It can be very useful to understand.Etiquette is very import but I n____ to listen very carefully to understand it I can understand,but just want to understand in order to bec 英语翻译B:I’d love to,but I can’t understand it.How about seeing 为什么是It is easy to understand而不是It is easy to be understand we find____ is very hard to makehim understand it it's very difficult to understand the english hearing we be given to understand ... Many intelligent animals can be trained to understand human it is difficult to understand.中的to是什么词 英语翻译fire can be very useful,but it can also be very harmful