三年级上册 每日30词 ruler ruler ruler ruler ruler ruler ruler I have a ru 尺子 I have a ruler ['ru:l(r)] 我有一把尺子。 【例】I have a ruler. pencil pencil penci 铅笔 ['pensl] 我有一支铅笔。 eraser I have a pencil. eraser 每日30词三年级英语同步