it is difficult at

it is difficult at 英语翻译It is so difficult一at least I find it so difficult一to un It is not difficult to ____________the speaker at the gradua 1.It is difficult to breathe at （altitudes）,which parents found it is difficult/it difficult/it was difficult it is difficult work it is difficult A:At 9:00,I have ______.It is very difficult but it's intere It is difficult to find Li Lei is good at English and he thinks it's ( )difficult. English is very difficult .We need to work( ) at it every da 9.It is not difficult to ____________the speaker at the grad