difficult problems they are

意思翻译 这些都是难题 相似词语短语 difficult problems───难题；难问题 they are they───他们是他们 are they───是吗 who they they are───他们是谁 are they ok───他们没事吧 they are green───它们是绿色的 are they old───他们老了吗 They are duck───它们是鸭子 they are super───它们是超级的 双语使用场景 is difficult to...