ti seems very hard 什么this problem in an hour

ti seems very hard 什么this problem in an hour This kind of book is very popular.It （sell） out in an hour适当 in an hour /within an hour用什么时态 This is very serious problem什么意思 It seems you worked very hard on this writing,well done. Potos Developed In an hour什么意思 in an hour'stime什么意思 He seems to have some difficulty in solving this problem.同义转 英语翻译We'd been at this thing,hard,for almost an hour,some a l in an hour In an hour翻译 it is very hard to climb the mountain in one hour的同意句