be difficult to follow up be hard to keep up It is arduous to carry on
be difficult to follow up
be hard to keep up
it is arduous to carry on
難事用英文怎麼說
難於用英文怎麼說
難於啟齿用英文怎麼說
難於控制用英文怎麼說
難於理解用英文怎麼說
英語詞典收錄了最新的漢英詞典和英漢詞典，總共有200多萬個詞條，詞庫仍在不斷更新中。
